By triumphing at his home race at Zandvoort last weekend, Verstappen equalled Red Bull predecessor Sebastian Vettel's record of nine consecutive wins, and thus victory at Monza will put him out on his own on 10 wins.
Gasly, who won the race with AlphaTauri in 2020, cautioned that achieving success at the Italian venue isn't always straightforward.
"I think this weekend is actually probably the trickiest one for Max," he said. "It's Monza, it's a very different track, you're very low drag.
"Quite a lot of incidents can happen into Turn 1, you have a massive gain with DRS, so if someone is fast enough to stick to your DRS they always could get a chance.
"I'll be surprised if he pulls like a 30-second lead like he can do on some other tracks."
Gasly also praised Verstappen for the way he has approached the 2023 season, calling it "very mature."
"You've got to appreciate what he does because he doesn't do any mistakes," he said. "Even last weekend you can have the faster car and have a lock up and go straight and miss it so. I think he's been very mature in the way that he's taken risks when they were there.
Source: Autosport