And at Sunday’s match, some fans told Newsbeat they were optimistic about Rees-Zammit’s future.
“There’s so many big names that flop but one good game and he could set a season on fire,” says Tom, from London, who’s been coming to NFL games in the capital for 10 years.
Jags fan Bernard who travelled from Florida to support his side is excited too.
“He’s a good addition for us,” he says. “He brings a different aspect of the sport, different techniques we can use.”
The Jags are among five US teams in the UK for the 2024 NFL London Games, being held at Tottenham Hotspur Stadium.
There’s one final match between New England Patriots and Jacksonville Jaguars on 20 October.
More than 60,000 fans attended each game and Henry says the sport is making an effort to grow, particularly with younger audiences.
He says there’s been a “global peak of interest” in the past year since Taylor Swift confirmed her relationship with Kansas City Chiefs player Travis Kelce, which he hopes will carry over to UK fans.
“The entertainment that comes with the NFL, which includes Travis and Taylor, that is in our DNA,” Henry says.
“What we have to do is then convince them the sport is awesome as well.”