Rafael Nadal has said he is worried how his healed knee would react after he makes his long-awaited comeback in the upcoming exhibition tournament in Abu Dhabi on December 27 following a seven-month hiatus.

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Nadal admitted it might take him some time to return in top form, but added that he trusted his medical staff, Stuff.co.nz reports.
The 26-year-old Spaniard is set to play an exhibition tournament in Abu Dhabi on December 27, his first action since being sidelined with tendinitis in his left knee following a second-round loss to then 100th-ranked Lukas Rosol at Wimbledon in June.
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