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Fernando Alonso has admitted he is unsure if he will be fit enough to compete in this weekend's Chinese Grand Prix.
The Spaniard missed the Bahrain Grand Prix after suffering a broken rib in the season-opening weekend in Australia, although many felt he was lucky not to suffer further injury such was the ferocity of the crash.
The 34-year-old will be examined by doctors from the governing body, the FIA, on Thursday and they will make a decision on whether he can participate.
"Until I get the all-clear from the doctors to race, we cannot assume anything," he said.
If the McLaren driver cannot race in Shanghai he will be replaced by the team's reserve driver, Stoffel Vandoorne.
The Belgian out-qualified team-mate Jenson Button at the Bahrain Grand Prix and he impressed in the race itself, picking up a point by finishing in 10th place.
Due to his injury Alonso has been unable to perform his usual training programme since Australia and he faces a race against time to prove his condition is acceptable to compete in Shanghai.