Chelsea manager Thomas Tuchel says Manchester City are the "benchmark" before the two clubs meet in the Premier League on Saturday.
Tuchel added the way top-flight leaders City have dealt with injuries and Covid-19 this season is the difference between the two sides.
Chelsea go into the game at the Etihad Stadium 10 points behind their rivals.
"Maybe it's luck, maybe they do it better, but they have less injuries from key players," said Tuchel.
Blues boss Tuchel added: "[They have] less players out and less weeks where they miss them.
"And they did not suffer from Covid as we did over many weeks so this is a huge difference.