( CNN ) -- Andres Iniesta could miss Spain 's opening game at the World Cup after suffering a thigh injury in a warm-up match . The Barcelona midfielder set up two goals for Spain in their emphatic 6-0 win over Poland in Murcia on Monday , but was substituted after just 39 minutes . Iniesta missed a large chunk of Barcelona 's season with a thigh complaint , but team doctors insisted the injury was only minor . `` We substituted him because he had some discomfort in the back part of the thigh , '' Spain 's team doctor Dr Oscar Celada was quoted as saying by the UK Press Association . `` He did n't notice any tear and it has not got any worse . It was at the start of the match and as he was n't comfortable , we made the change - it 's a minor muscle injury . `` We will calmly carry out tests on Wednesday , but we can initially rule out any muscle tear . It 's a minor injury , but we have to take precautions , '' he added . Two of Spain 's other injury doubts , Arsenal midfielder Cesc Fabregas and Liverpool striker Fernando Torres , both came on a substitutes against Poland -- and scored -- as they look to step up their fitness . It was Torres ' first action since playing for Liverpool against Portuguese side Benfica back in April . `` It was almost two months without playing since the Benfica game and I was really keen to come back , '' he said after the match . `` They have let me play for a while today and it was great to go out there and score . '' As for Iniesta , it remains to be seen whether he will play any part in Spain 's opening Group H game against Switzerland on June 16 .
Andres Iniesta is a doubt for Spain 's opening match of the World Cup . Iniesta was substituted after 39 minutes in warm-up match against Poland . Comment: The first thing to understand about this injury, and why it happened so early on, is that there are two ligaments involved : one called " medial collateral ligament " ( MCLL )