Man United slumped to their first defeat under Ralf Rangnick, losing 1-0 to Wolves at Old Trafford on Monday.
Joao Moutinho netted a late winner to secure a famous Wolves victory.
But the defeat leaves Rangnick's side in seventh place, four points behind fourth-placed Arsenal who occupy the final Champions League spot.
And speaking after their home defeat, Shaw questioned the mentality within the squad and said that he doesn't think all the players were there 'together' during the match in a worrying claim.
He also appeared to aim a thinly-veiled dig at Rangnick in a damning interview.
The 26-year-old, though, praised the defensive display of Phil Jones, who was making his first appearance for the club since January 2020.
🗣️ "Phil Jones should be proud of himself."— Sky Sports Premier League (@SkySportsPL) January 3, 2022
🗣️ "Maybe the manager can bring some ideas."
Luke Shaw talks through #MUFC's defeat and praises Phil Jones for his performance after two years out of the side. pic.twitter.com/V8mitOGlBG
"Not good enough, we really struggled," he told Sky Sports.
"We couldn't get hold of the ball and when we didn't have the ball we weren't aggressive enough. We didn't put them under any pressure.
"It maybe looked like an easy game for them. A disappointing performance and result.
"We didn't have many options on the ball and we weren't on the front foot."
Shaw added: "We have to put more pressure on them, we have to have intensity. Us players, we have been here a long time, maybe tonight we struggled, I didn't think we were all there together. You look at the players we have, we have unbelievable quality but sometimes quality is not enough.
"We need to bring the intensity and more motivation. Inside the dressing room, we know what we want but out on the pitch we need to give 100 per cent.
"To win these types of games we all need to be 100 per cent committed. It is tough and disappointing."
The Red Devils put their faltering league campaign to aside for their next match, as they host Aston Villa in the FA Cup on January 10.
Featured Image Credit: Sky Sports/PA
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