Overview
- Forest completed the transfer on Tuesday, August 11, signing Diomande to a four-year contract with a club option for a fifth year for a reported fixed fee of about €40m (≈£34.3m).
- Diomande is a 22-year-old Ivory Coast centre-back who made roughly 132 appearances for Sporting, helped win consecutive Primeira Liga titles and featured at the 2026 World Cup.
- Reports and club statements say late-stage hold-ups were resolved and that the remaining paperwork related to agent fees and payment structures was settled before the announcement.
- Manager Oliver Glasner sought Diomande for his passing accuracy, physicality and suitability to a back-three system, where he will compete with established centre-backs for a starting role.
- The signing is part of Forest’s summer rebuild and follows major sales that increased transfer capacity, giving the club a defensive upgrade now and potential resale value later.