Sancho has been linked with a move to Old Trafford but transfer talk has gone cold of late after reports United were only willing to pay up to £50million for his services.
Sancho is valued by his current club at closer to £100m, leaving any proposed deal at a standstill.
"I'm not going to sit here and say, 'Oh no, he's not good enough!' because of course he's good enough.
"He's got pace, he's got the ability to go past players, score goals and create.
"I think ultimately all those kind of things are going to be down to financial issues coming out of Covid-19 – financially, it's hit every football club.
"But Manchester United will undoubtedly look to strengthen and look to add to what they have."