Chelsea boss Jose Mourinho says he will assess a number of players ahead of Saturday's game against Crystal Palace.
The Blues face Neil Warnock's side determined to improve their five-point lead at the top of the table but the Portuguese could be forced to rest a number of players who were involved with their respective national teams.
"We have some problems, yes. Ramires, Drogba, Diego Costa, Schurrle, Mikel, it's a long list," Mourinho said on Friday.
"[Diego Costa is a doubt], yes.
"The Spanish team played in Luxembourg on Sunday. I gave them Diego, [Cesc] Fabregas and Azpi [Cesar Azpilicueta] two days off [Monday and Tuesday], so they had to report Wednesday at 3pm.
"Diego was here Monday at 9am. That shows you how strong he is."
Costa featured in both games against Slovakia and Luxembourg for Spain and scored his first international goal but Mourinho was not amused by Vicente Del Bosque's decision.
"They [national coaches] have the power. We don't have the power."