As a result, United have opted to look elsewhere for a new signing with Mourinho seemingly desperate to strengthen the central defence before the transfer deadline.
Alderweireld had an excellent World Cup campaign for Belgium and helped his side reach the semis.
United face Leicester City in the season's opener next Friday. "We will see. The final opinion [on if he stays or goes] is with the coach [Valverde]".
The Spanish publication claims the Toffees have struck a deal after the Spanish giants' contact with Manchester United over the defender came to an end.
But fans hoping to catch a glimpse of him in the Supercopa de Espana against Sevilla next Sunday night may be disappointed, according to Valverde.
It seems there will be a new centre-back joining Manchester United in the next 48 hours. Russo apparently demanded increased agent's fees and as a result Mina appears set to stay at the Camp Nou.
Alderweireld could wait a year to become available but Graves reckons he will be heading to Old Trafford in this window.
Although the centre-half featured sparsely last season after a falling out with Mauricio Pochettino, Alderweireld is still a top-class defensive option and cannot simply be replaced in the pecking order by the likes of Cameron Carter-Vickers. The Mancunian club are closing in on a £60m deal for Tottenham Hotspur defender Toby Alderweireld.
Alderweireld, 29, has plied his professional trade in England since 2014 following a transfer from Atletico Madrid.