Sanchez, 29, joined United in a swap deal involving Henrikh Mkhitaryan and arrived surrounding major fanfare as one of the Premier League's leading performers during his time at Arsenal.
Currently, on a reported earning £391k a week salary as the club's highest paid player, Sanchez has scored three goals in 23 games since his high-profile January switch.
And former Arsenal striker and BBC pundit Ian Wright feels the clock is ticking for the Chile international.
"If I was a businessman, I'd see how it goes for the rest of the season then look to offload," Wright told BBC Radio. "It's because of the wages he's on."
"For me, right now, if United had paid money for him they'd be thinking: 'How are we going to get that back?'
"Sanchez will have to take a hit on his weekly wage [if he joins another club]. Nobody will pay a fee for him, because of the way he's playing.
"He does not warrant a place in the team when you have Martial and Marcus Rashford waiting to play," the Premier League expert added.
"You look at him at United: he's not shackled, he's got freedom. His form will have to kick in to justify a place."