Nottingham Forest have completed the signing of Ousmane Diomande from Sporting CP for a reported €40M. The 22-year-old Ivory Coast international arrives as a right-footed, 190 cm center-back with a profile that mixes range, recovery speed and passing quality. He becomes one of Forest’s marquee summer arrivals and brings recent Champions League and international experience. For supporters tracking the move, Sofascore has the full statistical picture from Portugal, Europe and the World Cup.

Transfer confirmed: fee, date and why it matters

The deal was finalized on August 10, 2026, with Forest paying €40M to Sporting CP. For Forest, that level of investment signals a clear push to stabilize a defense that conceded 51 league goals last season. It also adds a ball-playing option who can help Oliver Glasner’s team build from the back. For Sporting, the sale caps a sharp rise in market value since January 2023. They signed Diomande from FC Midtjylland for €14.5M, helped develop him through domestic and European games, then moved him on at a profit. The timing fits Forest’s transfer window and pre-season schedule around the City Ground. It also follows a mixed run of friendlies that included defeats to Barcelona and Udinese, a win over Portimonense, and a draw with Vitória SC. In short, this is a move with sporting and financial logic for both clubs. On Sofascore, you can already see how his past numbers translate to Forest’s needs.

Form check: numbers that travel well to England

In Liga Portugal 25/26, Diomande played 17 matches and 1,297 minutes, posting a 93.1% pass completion and 51 accurate long balls at 67.1% accuracy. He added 59 clearances, 13 interceptions and 11 tackles, winning 91% of those tackles. In the air he won 35 duels at 57% and recorded six clean sheets. There was one error leading to a goal and five yellow cards, reminders that he is still refining his game at 22. In the Champions League he featured nine times, scored a headed goal, and won two thirds of his aerial duels. He made 32 clearances in Europe, kept two clean sheets and completed 93.5% of his passes. His top speeds hit 33.89 km/h domestically and 32.868 km/h in Europe, useful for covering space behind the line. At the 2026 World Cup he started once, kept a clean sheet and posted a 7.3 Sofascore Rating, completing 72 of 74 passes at 97%. The blend of accuracy, range and recovery shows up consistently across competitions.

What Nottingham Forest need and how he fits

Forest finished 16th in the Premier League with 44 points, scoring 48 and conceding 51. Team data shows an aerial duel win rate of 47.2%, which is an area Diomande can boost given his 57% win rate in Portugal and 66.7% in Europe. Forest also logged 973 clearances and nine clean sheets, numbers that could rise with a center-back who reads the box well and clears decisively. The side’s average possession was 46.8%, so secure distribution from the back is at a premium. Diomande’s 93% pass accuracy and comfort hitting long diagonals should help connect defense to attack. Errors leading to goals were a problem at Forest with 10 last season, so decision-making will be under the microscope. Diomande did have one such error in the league but otherwise kept risk under control. With Glasner favoring organized back-line structures and quick transitions, his speed and first pass look like a natural fit. Expect him to wear 26, bring height on set pieces, and add a calmer first phase when building play.

What this means for Sporting CP and the player’s path

For Sporting, this is the latest example of smart trading. They turned a €14.5M signing from Midtjylland in January 2023 into a €40M sale, after two seasons that included nine Champions League appearances. The club also showcased him in a system that asked center-backs to defend big spaces and pass cleanly, which built his profile. Diomande’s path took him from Midtjylland U19 to a loan at Mafra, then to Sporting, and now to the Premier League with Forest. Each step added minutes, responsibility and sharper competition. The sale funds Sporting’s next cycle while rewarding a development plan that clearly worked. For the player, it is a chance to test himself weekly in England and keep his national team place secure. His World Cup start and clean sheet support that international trajectory. The move closes one chapter in Lisbon and opens a new one at the City Ground with meaningful upside.

A steady upgrade for a defense that needs one

Forest’s recent friendlies included narrow defeats to Barcelona and Udinese, a 4-1 loss to Sporting, a win against Portimonense and a draw with Vitória SC. That mixed record underlines why adding a defender who brings clearances, aerial presence and safe passing should help quickly. In league play, Forest created 69 big chances and completed 12,739 passes at 82.1% accuracy, so better progression from the back can lift the whole structure. Diomande’s 3 key passes in Portugal and one Champions League big chance created are small but encouraging signs of line-breaking intent. He also blocked four shots in Europe and seven domestically, a habit that can shave goals against over a season. The five yellow cards suggest an assertive style that will need timing in the Premier League. But the overall picture is of a defender who shortens danger, wins his share in the air and keeps the ball. Track his debut and match-by-match Sofascore Rating on Sofascore, along with live stats and heatmaps. It looks like a clean fit on paper, and now it is over to the pitch.