Leicester City boss Nigel Pearson was left frustrated with their 2-0 defeat at West Ham United.
Pearson rued his side's failures in both attack and defence.
"Individual mistakes have been costly for us, but you've got to score enough goals and we've just not been doing that," Pearson said.
Pearson was fined £10,000 and given a one-match touchline ban following his altercation with a fan during last month's loss to Liverpool.
But Pearson, who often watches from the stand, was on the touchline at Upton Park as he awaits the written reasons for his punishment from the Football Association.
The supporters sang about the Foxes boss early in the contest.
"It's not a story about me," said Pearson, whose side host Tottenham on Boxing Day.
"What is important is that the fans stay behind the club and the players."