Chelsea boss Jose Mourinho is still simmering over Diego Costa's injury suffered on international duty with Spain.
Costa is out of Tuesday's Champions League Group G clash with Maribor with a hamstring problem which has plagued him persistently this season.
Mourinho believes it was exacerbated by playing against Slovakia and Luxembourg during the international break this month and took a swipe at Spain boss Vicente del Bosque.
"It's the same problem that he's having, but now an injury, not an almost injury,'' said Mourinho, who is uncertain when Costa will return.
"It's simple. He's not training because he's not in condition to do it.
"Tomorrow he cannot play. Let's see what happens for next weekend, but next weekend is not important.
"I don't have Manchester United (on Sunday in the Premier League) in mind. I have Maribor in mind."
