Asked where United would be without Fernandes, Pennant said on talkSPORT: "I think relegated. I genuinely think they'd be back fighting out with Ipswich."
Former Tottenham midfielder, Jamie O'Hara, added: "Without him they're just a disaster. Maybe he's starting to get the credit he probably deserves because of the performances. He's a great player. He is top. When I watch him play and he's just like... he is unbelievable. He's one of them players that you just want to have in your team.
"And I know he can moan. I know he throws his arms up in the air. That's because he's had garbage around him for ages. He has stepped up this season for them. He must be standing there sometimes thinking, 'what am I doing playing with these?'"