Fernando Alonso would return to Formula 1 as a clear top-three driver.
Now, Verstappen is returning the compliment by predicting that a 2021 return to F1 for the 38-year-old Spaniard would be a success.
"For me, Fernando is one of the best drivers," the Dutchman told the Spanish edition of Auto Bild.
"It is a pity that I never really raced against him, because he did not have a very competitive car at the time.
"But I think if Alonso was here with a top car, he would be among the top three to win the world championship," Verstappen added.