England wing David Strettle suffered his third foot injury in little more than a year, to cast a shadow over Harlequins' 30-23 Guinness Premiership victory against Worcester at Sixways.
Strettle went off at half-time after Quins scored tries through Ugo Monye (2), Gonzalo Tiesi and Mike Brown.
He missed last year's World Cup after breaking down in training, then lasted less than 15 minutes of England's RBS 6 Nations campaign last term when he was hurt during the Twickenham opener against Wales.
Quins boss Dean Richards said: "David has hurt his foot. He will have a scan tomorrow.
"He came off as a precautionary measure, and we will have to wait and see what the results of the medical checks are."
Quins moved into the Premiership's top four, after a remarkable blitz of three tries in five minutes helped them secure a bonus-point triumph.
Richards added: "To come here and take five points is a big ask.
"I don't think there are many sides who have done that.
"I am a little bit disappointed we didn't capitalise on our first-half performance, but we got the result we wanted."
England flanker James Haskell insists he will be pushing as hard as possible to be back from a toe injury in time to make his case for a spot in Eddie Jones' side looking to defend their RBS 6 Nations title next year.