Kompany spent Wednesday with club doctors at Celtic Manor, their base for the week ahead of Saturday's return to the Liberty Stadium, as they attempt to diagnose the exact problem.
"I hope he is OK," Clichy said. "It was his first game back after a long period of time away. Hopefully it was more tiredness than anything else.
"We all know he is a great player and great leader so to have him back is a massive bonus for the team."