Rafael Nadal has described Wimbledon's decision to ban Russian and Belarusian players from competing at this year's tournament as "very unfair".
The All England Lawn Tennis Club recently announced that players from the two nations are prohibited from competing in the event following Russia's invasion of Ukraine.
World number one Novak Djokovic labelled the decision "crazy", while Billie Jean King and governing bodies the ATP and WTA have also called for a rethink.
Nadal has now joined the ranks of those people questioning the decision, with the 35-year-old saying it is not fair on the players from those countries.
"I think it's very unfair on my Russian tennis mates, my colleagues," Nadal told reporters.
"It's not their fault what's happening in this moment with the war. I'm sorry for them. Wimbledon just took their decision. The government didn't force them to do it.
"Let's see what happens in the next weeks, if the players will take some kind of decision in that regard."
Nadal will return to action following a rib injury at the Madrid Open in his homeland and the 21-time grand slam winner accepted that it might not be without difficulties.
"Talking about the injury, I'm recovered, I feel good," Nadal added.
"Talking about my tennis game and preparations, well, it's a completely different story.
"Anyone who has broken a rib knows how limiting it is, very painful, especially the first weeks. I wasn't able to do anything without a lot of difficulties, even to fall asleep because of the pain.
"I have improved compared to when I came here but I still have ups and downs because it's been a long time without being in these kind of situations and it's going to be a difficult week, for sure."