Chelsea striker Tammy Abraham was forced out of his side's Champions League encounter with Valencia on Wednesday in what could be a major blow for the Blues.
As the first half was winding down Abraham went up for a header with Valencia defender Ezequiel Garay and appeared to land awkwardly on the Argentine's legs as both players fell to the ground.
Abraham walked to the sideline in considerable pain as he appeared to be holding his side, with Chelsea physios examining him.
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As the half-time whistle blew a stretcher was brought out for the England international, who had to be carried from the pitch.