Jeffrey Bruma believes Chelsea's players are solely responsible for failing to beat Aston Villa on Sunday.
The 19-year-old made his Premier League debut in the game and his display was one of the positives to come out of the 3-3 draw.
However, what should have been a memorable win was dashed as Villa grabbed a late equaliser through Ciaran Clark.
Blues boss Carlo Ancelotti is coming under increasing pressure, but the young Dutchman says the squad have to be held accountable.
Leaders Manchester United are now six points ahead with a game in hand but the champions are remaining positive.
Bruma told Chelsea TV: "Everyone knows Premier League games are always fast, quick strong, so if we don't play our game then they will play their game and you will see that they will dominate us. It can happen.
"At the end, we were dominating them again and then you saw that we scored a goal.
"After, I think we should've kept the ball and been strong in the marking because the guy from Villa had a free header."
Bruma, though, was at pains to stress that Clark was not his man.
"I was marking my man. I think everyone else was, or maybe someone forgot to mark his one," he added.
Emile Heskey gave the Chelsea debutant a baptism of fire as the youngster struggled at times to cope with his robust approach.
Indeed, Heskey managed to climb above the teenager to head in Villa's second.
"He's a very strong guy," he continued.
"Obviously, when you play against a striker like him, you can't win every ball. You can't come in front of him because he is so strong."
Are Chelsea out of the title race?