Chelsea striker Diego Costa has injured his hamstring and could be out of action for up to six weeks, according to reports in the English press.
Costa pulled up sore in training on Wednesday and is in doubt for Saturday's clash away at Everton.
Chelsea are waiting for further assessment on the injury before making a call on how long the Brazilian-born Spanish international may be out, with both the Daily Telegraph and The Sun estimating he could miss as much as six weeks of action.
Chelsea's loss of Costa to injury could prove pivotal to a number of clubs as the summer transfer window winds up. The London club may now have to dip back into market for another striker.
A move for Monaco's prolific striker Radamel Falcao, who is being courted by Real Madrid, has already been speculated.
Fernando Torres' proposed move to AC Milan could also now be in jeopardy as Jose Mourinho's squad scrambles to cover a possible Costa absence.