BRUSSELS, June 21 (Reuters) - European Commission President Jean-Claude Juncker spoke to Greek Prime Minister Alexis Tsipras on Saturday and will speak again on Sunday to seek a solution to Athens' debt crisis, an EU official said on condition of anonymity.

Over the weekend, senior officials have remained in close contact ahead of a meeting of finance ministers and euro zone leaders scheduled for Monday, the official said.

(Reporting by Alastair Macdonald, editing by Barbara Lewis)