Antonio moved to West Ham from Nottingham Forest on deadline day, and he is still adapting to his new surroundings.
As a result, he was given a chance to play for the under-21 team against Newcastle United, and his performance caught the eye of Westley, who thinks he will make a positive impact in the senior squad.
“It was nice to see Michail play with zest and such enthusiasm," he said. "Giving him 60 minutes always the plan and he was a real powerhouse. There’ll be a lot of good things to come from him in the first team for the fans no doubt.”
West Ham drew the match 2-2, and another player Hammers supporters had their eye on was youngster Luka Belic.
The Serbian striker has only recently moved to Upton Park, and this was his first chance to show what he can do - with Westley predicting big things from the 19-year-old in the future.
“Young Luka Belic made his debut, his clearance came through late this afternoon, he got a feel for it today but there’ll be more to come from him," Westley added.
In all likelihood, Belic will be given the rest of this season to adapt to English football in the under-21 ranks.
Antonio, however, will be hoping to make an impact for the first-team over the coming weeks. It has been difficult to break into Slaven Bilic's starting line-up due to the Hammers' good form, but he will be looking to take an opportunity when it comes his way.