The West Ham centre-back was forced off before half-time on Saturday in Wales´ 3-1 Euro 2008 qualifying defeat to Cyprus but after a day of intense treatment Collins was sent back to his club where a further assessment on his fitness will take place.
"I have hurt my calf again and I really do not know what is going on with it," Collins said. "I have been struggling with it for a while now, it is the third time I have done something to it. I need it to be looked at."
Copyright (c) PA Sport 2007, All Rights Reserved.