Nigerian international and Leicester City forward has re-join his former club on loan until the end of the season according to Skysport.
CSKA Moscow after the two clubs agreed a loan deal, according to Sky sources.
Musa joined Leicester from the Russian side for a club-record fee of £16m 18 months ago.
But his opportunities have been limited and he has made only 18 appearances and scored two goals
His only involvement in the Premier League in the current campaign came when he was an unused substitute for the game at Liverpool on December 30.
If the deal is completed the Nigeria international will be going to Russia where his country will be competing in the World Cup this summer