Crystal Palace and Leicester City are also reported to be interested in the 22-year-old midfielder, who spent the 2019-20 campaign on loan at West Bromwich Albion.
However, according to the report, West Ham manager David Moyes does not want to sell the youngster and wants to keep him at the club.
It has been further claimed that the 22-year-old midfielder is valued at £15 million.
West Bromwich Albion loan spell
Diangana joined West Brom on loan from West Ham in the summer of 2019 and played an important role in manager Slaven Bilic’s side clinching automatic promotion to the Premier League.
According to WhoScored, the youngster made 23 starts and seven substitute appearances in the Championship for the Baggies this past season, scoring eight goals and providing six assists in the process.
West Ham United stay
Diangana is ready to take the next step in his career, and West Ham should keep hold of the player and include him in the first team next season.
The 22-year-old played on the left and on the right flank during his spell at the Baggies, and he could be a very good and important creative outlet for the Hammers next season.