Mourinho views the sale of Evans as a major misstep by Van Gaal and the United boss is desperate to beat Arsenal and City to his signature.
The Mirror claim United are ready to fight off competition from Arsenal and City who are preparing bids for Evans.
The Premier League pair failed in moves for Evans in the summer, but have been keeping tabs on the defender.
Manchester United 2017/18 Fixtures
West Bromwich Albion (A) – Sun Dec 17
Bristol City (A) – Wed Dec 20 (EFL Cup)
Leicester City (A) – Sat Dec 23
Burnley (H) – Tues Dec 26
Southampton (H) – Sat Dec 30
Everton (A) – Mon Jan 1
Stoke City (H) – Sat Jan 20
Tottenham (A) – Wed Jan 31
Evans has continued to impress for club and country and travels to face his old side United at Old Trafford on Sunday.
The Northern Ireland international came through United’s youth ranks and made 198 appearances for the Red Devils.
It is believed West Brom are open to Evans departing in January if a side meets their £30million asking price.
United are in need of a centre-back after it was confirmed Eric Bailly would miss the rest of 2017 through injury.
Bailly is expected to spend at least three months on the sidelines, prompting Mourinho to dip into the winter transfer market.
City too need a defender after Vincent Kompany joined John Stones in the treatment room.
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