Chelsea manager Thomas Tuchel said "there are so many uncertainties around the situation of our club" amid Russia's invasion of Ukraine.
Tuchel was speaking prior to his side's Carabao Cup final against Liverpool at Wembley on Sunday.
"We should not pretend this is not an issue," said Tuchel.
"The situation in general [in Ukraine] for me and for my staff, and for everybody at Cobham, the players, is horrible.
"Nobody expected this. It's pretty unreal, like I said it's clouding our minds, it's clouding our excitement towards the final.
"And it brings huge uncertainty, much more to all the people and families who are actually in the moment more involved than us.