Chelsea manager Thomas Tuchel says "things got heated" in a "serious situation" between Kepa Arrizabalaga and Antonio Rudiger on Sunday.
"We needed to interfere in the situation, so that was serious," Tuchel said on Tuesday.
"They cleared the air immediately and there was nothing left the day after."
Tuchel said the argument stemmed from an incident in training and not the loss to West Brom.
Rudiger was reportedly sent in early after the two players were seen to push one another.
"It got heated up between Toni and Kepa," the German said.