This news will certainly come as a surprise to many. Along with Declan Rice, the 21-year-old was one of the bright sparks to emerge from the Hammers last season.
The rising West Ham star was given opportunities due to long-term injuries to Jack Wilshere, Carlos Sanchez, Andriy Yarmolenko and Manuel Lanzini.
Diangana made the most of the chances which were presented to him by Hammers manager Manuel Pellegrini as he went on to make 17 Premier League appearances, registering one assist.
One of his memorable games came when he managed a brace during West Ham’s 8-0 thrashing of Macclesfield during a Carabao Cup game.
West Ham fans are largely divided on what to do with Diangana next season. Some feel that he is good enough to play for the first team and will add strength in depth to Pellegrini’s side as they push for a Europa League qualification spot.
On the other hand, some feel that he will be better off with a loan spell next season as it will allow him to develop his game further.
Diangana may not get regular game time next season with the likes of Yarmolenko, Lanzini, Wilshere and Sanchez having returned from injury as well as the addition of Pablo Fornals.
He may just be better off going out on loan to a Championship club. The West Ham talent will likely not be short of offers due to his exploits from last season.