The Spanish tennis ace has only won one title so far in 2025 but the former world number one expects the Spaniard to find his best form as the year goes on.
Wilander told TNT Sports: "I think Carlos Alcaraz is going through what Carlos Alcaraz will be going through for the rest of his career, which is that there are going to be inconsistencies.
"He's going to pull off some miracles at times, and then those miracles are going to help him win matches, and he's going to pull off miracles at different times, and he's not going to win the match in the end.
"But I do think in the end, Carlos Alcaraz is going to be quite inconsistent in terms of results. We're so used to not seeing a former world number one and most probably a future world number one to be that inconsistent."
Wilander feels that opponents have been able to figure out Alcaraz's weak points and thinks that the four-time Grand Slam winner could be vulnerable in matches when the stakes aren't quite as high.
The seven-time major champion said: "Well, he can bounce back at any time. That's the thing about Carlos Alcaraz.
"He could bounce back within two weeks because of the way he plays tennis.
"Even though he won the French Open last year, I'm not sure clay is his best surface, but it wouldn't surprise me at all if he goes and wins the French Open again, and does a repeat, because that's the quality that he brings.
"I'm just saying that I think these results will happen here and there. Unfortunately, they have been happening in some Grand Slam tournaments.
"But I do think it's more in the regular tournaments that Carlos Alcaraz will have problems and I do think that he will bounce back and do well at the French Open."