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Zverev reached the semi-finals at Roland Garros last year, but his chances of winning a maiden grand slam title were ended when an ankle injury forced him to retire from his last-four clash with eventual champion Rafael Nadal.
Zverev subsequently required surgery to repair damaged ligaments before a bone edema suffered in September further delayed his return to the court.
The German finally made his competitive comeback in December but struggled at the Australian Open the following month, crashing out in the second round to unheralded American Michael Mmoh.
With the 26 year-old heading to Roland Garros later this month looking to reach the semi-finals for the third straight year, Becker has serious doubts over his compatriot's chances of claiming victory.
Asked whether he felt Zverev could come out on top, Becker told Stats Perform: "I hope so. I hope so.
"At the moment he is in a bit of a crisis because he had a very severe injury last year in the semi-final against Nadal.
"He literally broke his ankle. He was out for seven months and just came back this year. So he's still struggling.
"I think for the title, I don't think anybody German [will win] this year. I think it'll be a Spaniard, it'll be a Serbian, it'll be an Italian, somebody like that."
The French Open was the only grand slam singles title that evaded Becker during his hugely successful career, with the tennis great winning three Wimbledon titles, two Australian Open crowns and the 1989 US Open.
The former world number one believes the beauty of tennis lies in individuals coping with pressure, explaining there is no opportunity to exploit the talents of others to reach the pinnacle of the sport.
"Tennis is a very important sport," Becker said. "It's an individual sport. You can actually see it with one player, whether he's winning or losing.
"In a team, sometimes people can hide behind the likes of [Lionel] Messi or [Kylian] Mbappe. You're still a World Cup winner, even though you know it was either Mbappe or Messi, right?
"In tennis, it's not possible. You have to be the better player and that is why tennis is such a powerful sport, because you see who is better with your own eyes."
