The Red Devils booked a spot in the last eight of the competition as they overcame a 2-0 deficit with a home win against Olympiakos to stay in contention for the only piece of silverware still available to them after a dismal campaign.
Moyes was drafted in to replace the retiring Sir Alex Ferguson last summer, and has struggled to match his iconic compatriot’s management of the defending Premier League champions.
United were all but out of contention to retain their crown at the turn of the year, and suffered disappointing eliminations in both domestic cup competitions.
As well as this, the Scot’s transfer dealings have been underwhelming, with Marouane Fellaini and Juan Mata having cost in excess of £60m and failed to set the world alight at the Theatre of Dreams.
When asked by talkSPORT if he thought Moyes has much of a future at United, Sharpe said:
“I’m not sure.
“I was a bit concerned when Moyes first got appointed, I fancied someone a bit more creative.
“If they’ve got £100mililion to spend on transfers, I’m not sure you are going to give it to him to spend.
“If they’re still in the same position in the January transfer window next year, do you then give someone else a load of money?
“They are going to have to buy a whole new back four, because there’s a few of them going, and a couple of midfielders. I’m not sure about the buys he brought in already. He’s spent £60million and I don’t think he’s spent well.”