The Scottish speedy starts his F1 career with Force India and has made constant improvement, last race he done sixth-place in Bahrain, show again of his career-best achieved in Singapore in 2011 F1.
"Paul di Resta would be a very good target for Ferrari because Alonso probably has the best toolkit of knowledge and physically is one the best drivers in the world," said Stewart.
"Alonso is almost at his peak and to have a young driver such as di Resta be an understudy to Alonso is something I'd consider if I was at Ferrari."
Asked him, whether di Resta has what it takes to win a Formula One World title, Stewart said: "It's difficult to know.
"He has got an enormous amount of talent. I hope Scotland doesn't ask too much too soon from him. You've got to be with a top-class team in order to win, you can't do that with a second-rate team.
"Force India are trying hard to be a first-rate team but they're not there yet. Paul has been leading that team to better results. I think he's got every chance.
"We've got a great history of drivers, for a small country we are punching above our weight and Paul di Resta is the present generation of that."
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