West Ham insist Issa Diop is not for sale this summer.

The defender is being linked with Manchester United.

But Hammers bigwigs insist he is not for sale and will dig in if United come calling, says the Mirror.

The youngster was a key figure for West Ham last season, though, and boss Manuel Pellegrini and the powers that be do not want to sell him.

United conceded 54 goals in the Premier League last season, more than the likes of Leicester, Crystal Palace and Newcastle United.