Ousmane Diomande Nottingham Forest is a pairing that took the best part of two summers to arrange. The Reds spent a reported £34m to bring the Ivorian centre-back to the City Ground from Sporting CP, making him the most expensive defender in the club’s history and the second-biggest outlay of a window that ran to around £101m. He is 22, he has two Portuguese league titles and an Africa Cup of Nations winners’ medal already, and he arrives to play the position Oliver Glasner cares about most. This is the guide to Forest’s new No.2.
Who is Ousmane Diomande?
Diomande was born in Abidjan in December 2003 and is a product of Ivorian youth football rather than a European academy, which matters more than it sounds. Players who leave West Africa at 17 usually land in France or Belgium. Diomande went to Slovakia.
He joined FC ViOn Zlaté Moravce, a club with an average attendance in the low thousands, and spent a season and a half learning senior football in a division nobody scouts for glamour. It was enough. Sporting CP, whose recruitment department has made a speciality of finding players in exactly those places, signed him in January 2023 while he was still 19.
A defender who goes from the Slovak top flight to a Champions League back three inside eighteen months adapts quickly – the single most useful quality a Premier League club can buy in a 22-year-old.
What he did at Sporting
Rather a lot. Diomande arrived as cover and left as a fixture, playing on the right of Sporting’s back three under Rúben Amorim and then continuing in the same role after Amorim’s departure for Manchester United.
He won the Primeira Liga in 2023/24 and again in 2024/25, adding the Taça de Portugal in a domestic double, and played Champions League football in a Sporting side that beat Manchester City in the league phase. By the end of his time in Lisbon he was reported to carry a release clause well into nine figures in euros – the sort of number a selling club sets when it has no intention of selling.
Internationally he has been part of the Ivory Coast squad through the most successful period in the country’s recent history, including the 2023 Africa Cup of Nations won on home soil in February 2024. For a centre-back who cannot yet legally be described as experienced, he has played a startling number of matches that mattered.
The Ousmane Diomande Nottingham Forest transfer
Forest’s interest was not new. Glasner had reportedly tracked him for some time, and the club moved for him after the summer’s defining piece of business – Elliot Anderson’s departure to Manchester City for a reported £116m – gave the recruitment department room to spend properly.
The reported £34m fee sits behind only Liam Delap’s club-record move from Chelsea in this window, and it broke Forest’s record for a defender. He was joined by Xaver Schlager on a free from RB Leipzig, back-up goalkeeper Steven Benda, and Daniel Muñoz, who followed Glasner from Crystal Palace for a reported £22m on 31 August. The full ledger is in our summer 2026 ins and outs.
He wears No.2, which is a slightly unusual choice for a centre-back and a fairly clear hint about where Glasner intends to play him.
How he plays
Diomande is a front-foot defender. He is quick over ten yards and quicker over forty, he defends aggressively in front of his centre-back rather than dropping off, and he is comfortable stepping out of the line to meet a forward receiving to feet. In a back three that pushes high – and Glasner’s does – that recovery pace is the insurance policy that makes the whole thing viable.
He is left-footed, which gives Forest something they were short of, and he carries the ball forward willingly. Sporting used him to break lines from the right of the three, driving into midfield and forcing an opponent to commit before releasing. It is a habit that looks thrilling when it works and alarming when it does not.
The weaknesses are the ones you would expect of a 22-year-old who defends on the front foot: he can be drawn out of position by a clever centre-forward, and he gives away more fouls than a settled Premier League defender should. Neither is unusual at his age, and neither is unfixable. Both will be tested rather harder in England than they were in Portugal.
Where he fits in Glasner’s back three
Glasner arrived on 6 July 2026 and brought the 3-4-2-1 he used at Crystal Palace with him – the shape we broke down in our look at his formation. It asks for three central defenders every week: a dominant aerial presence in the middle, and two who can cover ground either side of him.
On current evidence that means Nikola Milenković centrally, Murillo to his left and Diomande to his right, with Muñoz and Neco Williams providing the wing-back platform in front. It is a back line with pace on both sides of a genuine defensive anchor, and on paper it is the best-balanced Forest have had in this Premier League era.
The complication is depth. Morato went to West Ham United and Zach Abbott to Southampton on deadline-day loans, leaving Jair Cunha as the only other natural centre-back in the squad – the situation we set out in full in our piece on Glasner’s centre-back cover problem. Diomande will not be rotated much, because there is nobody to rotate him with.
The start he has had
Bumpy, in a team that has been bumpy. Forest lost 1-0 at home to Leeds United on the opening weekend, went out of the Carabao Cup to the same opponents three days later, and then drew 2-2 away at Liverpool on 29 August, with Dan Ndoye and Morgan Gibbs-White scoring and Delap making his debut. Three games, no win, but the Anfield performance was much closer to the side supporters recognise.
New defenders in new systems take weeks rather than days, and judging Diomande on three matches in August would be daft.
What to expect
A defender who will make Forest quicker and occasionally more nervous, and who ought to be worth considerably more in two years than the Reds have paid. The pattern of Forest’s recruitment under Evangelos Marinakis is well established – buy young defenders early from leagues the market undervalues, develop them, and let the sell-on value take care of itself. Murillo arrived on exactly that basis and became the best defender at the club inside a season.
The next test is immediate. Tottenham Hotspur visit the City Ground at 3pm on Saturday 6 September with the Tricky Trees still chasing a first win of 2026/27, and Diomande will be asked to handle a forward line that runs in behind. Confirmed team news, as always, comes from the official Nottingham Forest website, and his Premier League appearance record is tracked on the Premier League’s own site.
Forest have spent big before and been burned. This one, at 22, with two league titles and a continental trophy already banked, looks like the sort of gamble that ages well.
