Nadal was making his comeback in Brisbane after spending almost a year on the sidelines with a hip injury, sustained during his second round defeat to Mackenzie McDonald in last year's Australian Open.

Nadal, winner of 22 Grand Slams, did not compete again last season after having surgery in June, and was using the Brisbane International as a warm-up for the Australian Open which begins on January 14th.

"I hope I can train next week and play the Australian Open, but I'm not 100 percent sure," Nadal said after his 5-7 7-6(6) 6-3 defeat.

Nadal, however, did not wish to make excuses or play down his opponent's achievement.

"What matters now is that I've been able to play three matches in Brisbane. My opponent played very well and you have to give him credit," the Spaniard said.

"I don't think it's the time to talk about that (degree of pain during the match). I have to leave satisfied and congratulate the opponent. We'll see how I wake up tomorrow and the day after."

Nadal said the pain is in the left hip, which caused him to miss so much time away from the court, but it may not be the same issue.

"The pain is in the same place, but I feel like it's a bit more muscular because of the tiredness.

"Last season it was the tendon and the feeling was completely different because I felt it a lot more. Today I didn't feel anything, what happens is that being the same place you get more scared."

Nadal has won the Australian Open twice, in 2009 and 2022, and is still hopeful of making this year's tournament, but does not expect to be challenging for the title.

"I hope it's just that I have a strong muscle after several days of playing and a tough match like this with Thompson," Nadal said.

"I already said that my goal was to be competitive in a couple of months."