The Brazilian had a slow start to life at Old Trafford following a £52 million move from Shakhtar Donetsk in 2018, but seems to have found his footing.
Watford striker Deeney came up against Fred during his time in the Premier League and he thinks the midfielder gives away possession far too easily.
The Hornets captain explained on talkSPORT: "Whenever you play against Fred - we certainly did it - you let him get it because he has to take three or four touches.
"He doesn't know how to do one or two touches. "Anyone that watches his game, he gets it facing the wrong way, turns, turns, chops, chops and he'll give you the ball three or four times a game."
Former Premier League striker Darren Bent was also on-air and quipped: "Hope Fred's not listening. Blueprint how to play against him."
Deeney hit back and admitted: "It's the truth. If you're anyone who studies football you'll know that, when teams are setting and they're waiting, you go and that one person is the trigger.
"You're waiting for it to go and then you bounce off him."
:soccer: "When you play against Fred you let him have the ball."- talkSPORT (@talkSPORT) October 21, 2020
:smirk: "He has to have 3 or 4 touches, gets it facing the wrong way & turns."
:punch: "He'll give you the ball three or four times... he's the trigger!"
Any teams facing #MUFC's Fred will want to listen to Troy Deeney here :joy: pic.twitter.com/AuQhxc2juM
Fred started with Scott McTominay in United's 2-1 win over Paris Saint-Germain in the Champions League on Tuesday and put in an accomplished performance.
Ole Gunnar Solskjaer was asked about the decision to choose Fred and McTominay over Paul Pogba, and he told reporters per Metro: "They're in good form now, they're good players and they played really well against Newcastle.
"They laid the foundations for the win in that game, and I think they laid the foundation today as well.
"Scotty played the first half as well with only one eye, that was the most impressive thing, because he lost his contact lens. So that was impressive."
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Featured Image Credit: talkSPORT and PA Images
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