Chelsea owner Roman Abramovich has been asked by Ukraine to help support their attempts to reach a "peaceful resolution" with Russia, the billionaire's spokesperson says.
They added Abramovich was contacted by Ukrainian officials and "has been trying to help ever since".
Ukraine has called for a ceasefire before peace talks in Belarus.
Russian President Vladimir Putin launched a military invasion of neighbouring Ukraine on Thursday.
Ukraine's health ministry said on Sunday that 352 civilians, including 14 children, had been killed since Russia's invasion began.
Abramovich announced on Saturday that "stewardship and care" of the club was being given to trustees of Chelsea's charitable foundation.