Tom Boonen (Quick Step) received further medical attention on Thursday after crashing at the end of Wednesday's Scheldeprijs Vlaanderen in Belgium.
Boonen got caught up in a pile-up in the final 100 metres of the race that saw fellow sprinters Robbie McEwen (Katusha) and Greg Van Avermaet (Silence-Lotto) take a tumble.
According to the AFP news agency, 2009 Paris-Roubaix winner Boonen has a suspected fracture in his right foot and is being observed to assess the injury.
Meanwhile, McEwen has confirmed that he suffered from concussion after the fall, but escaped any broken bones. A serious injury at this stage of the year could scupper the Australian's chances of competing in the Giro d'Italia next month.
McEwen's helmet is reported to have split into four pieces as a result of the crash. He is now taking a few days off training to recover from the fall.
The Scheldeprijs Vlaanderen semi-classic was won by Italian sprinter Alessandro Petacchi (LPR Brakes) - his first victory in Belgium.
Petacchi wins Scheldeprijs, Boonen crashes
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