Manchester United are sweating on the fitness of Matheus Cunha after the forward picked up an injury in training on Saturday . United face Everton on Monday in the Premier League and are already a forward down, with Benjamin Sesko on the sidelines - and now Cunha is a doubt. The Brazilian forward had been set for a key role in the match at Old Trafford, with Ruben Amorim likely to field him as a false No.9 in the absence of Sesko. But news of a possible injury blow arrived via an unusual source