Rafael Nadal says he is "not 100% sure of anything" after being injured in his quarter-final defeat by Australian Jordan Thompson at the Brisbane International.
Nadal failed to convert three match points as he lost 7-5 6-7 (6-8) 3-6 in three hours and 26 minutes.
The Spaniard, 37, was playing his third match since returning from almost a year out with a hip problem.
Nadal needed a medical timeout when he was 1-4 down in the deciding set.
A winner of 22 Grand Slam titles, Nadal said the pain in his left hip is in a similar place to the injury that required an operation in June 2023, but he hopes this one is just muscular.