The 24-year-old was left out of Belgium’s 1-1 friendly draw against Netherlands on Wednesday, as Liverpool’s Simon Mignolet was handed a start by head coach Roberto Martinez.
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Courtois was pictured watching on with a deeply bloodshot left eye, but he has since stressed the problem is not serious.
Writing via his official Twitter account, he said: “Everything’s ok with my eye, had it for 2 weeks and doesn’t effect my goalkeeping”.
The news will come as a relief to Chelsea fans, with Courtois having kept five clean sheets in a row prior to the international break to help Antonio Conte’s side climb into second place in the Premier League.
Belgium, for which Yannick Ferreira Carrasco scored an 82nd-minute equalizer after Davy Klaassen’s first-half penalty had put Netherlands in front, faces Estonia in World Cup qualifying on Sunday.
