"I do not know him very well as a driver.
In Formula 1 it is very difficult to compare yourself to a rider from another team, 95 per cent of your results come through the car," said Perez.
"Because of his car, he had a bad season, I think Williams had a lot of problems.
“But he certainly has talent."
"When it is wet, he always shows himself well with a bad car,” Perez said referencing the 2017 Azerbaijan Grand Prix.
“He is now coming to a great team, so he is in excellent hands to show his full potential."
Perez added that he isn’t worried about Stroll’s arrival given his father’s position saying: "Everyone, including the owners, has an interest in making the team successful.
“That's why both cars must be as good as possible.
"We both have to work hard and work together to get the team to the fore as far as possible."
Source: Motorsport.com in cooperation with Adam Cooper