That’s according to ex-Liverpool striker Stan Collymore.
The pair have been criticised for their performances this season and were powerless yesterday as Chelsea won 1-0 in the FA Cup final.
Sanchez has struggled to adapt following his January move from Arsenal while Pogba has yet to show the form that convinced United to splash out £89m to bring him back to Old Trafford.
Jose Mourinho is desperate for fresh faces this summer as he looks to keep up with fierce rivals Manchester City.
And Collymore believes United are capable of challenging again, as long as they keep David De Gea and their big-name players play to their potential.
“Alexis Sanchez is inconsistent and not enjoying his football at the moment,” he told the Mirror.
“But he is probably still worn out from a non-stop couple of years and we should see better from him next season.
“Paul Pogba still isn’t grabbing games like these by the scruff of the neck as he should.
“He is showing little glimpses of great passing and forward movement but not enough and, whatever has been the issue, he and Mourinho need to sort it out.
“David De Gea has to stay as well, while Romelu Lukaku has hit every benchmark in world football for his age.
“But they need more mobility in the ranks around them.
“They are the big dogs at United and they won’t see off Mourinho, but he has to bring in some nippy little mutts who will give them back their bark and bite.”