Spartak Moscow will automatically sign Victor Moses, provided they qualify for the UEFA Champions League this season, Goal reports.
The Russian giants will pay Chelsea £4million if they qualify for the elite European competition.
With a game in hand, the Red-Whites are level on 53 points with second-placed Lokomotiv Moscow.
Victory over Khimki on Monday, could boost their chances of grabbing the final Champions League spot, before the final game of the season on Sunday.
Moses – who has been at Chelsea since 2012 – has contributed three goals and two assists so far in 17 Russian Premier League games.