The Sun have reported that Mata has been told that he has no future at Old Trafford following the appointment of Mourinho. The daily tabloid paper goes onto say that Everton are preparing a £20 million offer for the Spain international.
The Spain international has frequently been linked with a loan move to Fenerbahce over the past fortnight. The Express newspaper has reported that Juventus are also interested in the £30 million rated playmaker.
The Portuguese manager offloaded Mata to United for £37m in January 2014 while he was manager of Chelsea because he believed Spaniard did not fit into his game plan.
The Spain international scored 10 times while providing 11 assists for United last season and has another two-years left on his contract.