Mark Schwarzer, a former Chelsea custodian, claimed that N'Golo Kante 'looked off' during the Blues' 3-1 loss to Arsenal at the Emirates.
The Frenchman played the entire 90 minutes, but he was unable to save Frank Lampard's squad from losing for the sixth time in a row.
Kante, 32, has had a very difficult season due to injury, appearing in just six Premier League games.
The France World Cup champion, though, has distinguished himself as one of the Blues' greatest players in the other games in which he has appeared.
He appeared to be off with his touch. Not on it was his passing. Although there was an effort, Kante wasn't the same as what we were used to seeing.
"The Chelsea team has some big names, but by Chelsea standards, they have had a terrible season."
The Gunners recovered from their 4-1 loss to Manchester City last week and regained first place in the standings before the Citizens' game against West Ham on Wednesday thanks to two goals from Martin Odegaard and another from Gabriel Jesus.