Neville was speaking after United's thrashing at Everton
Gary Neville has torn into Manchester United's players following their humiliating
4-0 defeat to Everton.
United were outplayed from the early stages onwards at Goodison Park, only managing their first shot on target in the 86th minute.
Ole Gunnar Solskjaer, only appointed as United boss on a permanent basis a matter of weeks ago, apologised to supporters in the away section at full-time.
"I'm furious," Neville said on Sky Sports. "The fact he's had to go over and apologise for them.
"I've often said over the last few seasons if you've got weeds in the garden you've got to get rid of them but there's some Japanese knotweed at that football club and it's attacking the foundations of the house and needs dealing with properly."
"Those players now, their heads are well and truly on the line," he added.
"I watched Manchester City yesterday who United are trying to get to in terms of the top of the Premier League - Bernardo Silva, Raheem Sterling, Kevin De Bruyne and David Silva - far better players than are in that Manchester United dressing room who work twice as hard.
"Everton ran 4kms more in the first half. Everton. Then you watch this mob out here (Liverpool), they die for every single inch on the pitch.
"Manchester United players, honestly, it's embarrassing just watching some of those out there today."
Neville made clear that he placed none of the blame on Solskjaer for United's performance but stated there is a "big problem" at the club.
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