Isaiah Thomas can be as fearless as they come, but Tuesday night’s game has a certain vibe that will provide a whole new challenge physically and mentally.

It will not only be his awaited return at the TD Garden, it may also be his first game this season (he has sat out all of the Cleveland Cavaliers’ 36 games this year due to a hip injury).

The two-time All-Star guard got dealt to the Cavs in a blockbuster trade this past summer along with Jae Crowder, Ante Zizic, the Brooklyn Nets’ unprotected 2018 first-round pick, and the Miami Heat’s 2020 second-round pick for Kyrie Irving.

Irving, who he himself, was in an identical position to Thomas when the Boston Celtics visited the Cavs in Cleveland during this year’s season-opener, offered respect and positivity.

Kyrie Irving told reporters and ESPN’s Chris Forsberg the following:

“That guy put on some performances, epic performances.

And, for the city of Boston, what he gave on a consistent basis, you were just wondering how that tough-nosed m—–f—– was just getting it done every single night and demanding from his teammates and playing with an edge that really cemented himself as a premier player in this league.

And you're just nothing short of happy for a guy like that. And whether or not he plays, it's going to be nothing but love for him from Boston.”

Though Isaiah Thomas only played two-and-a-half seasons for the Celtics, he had left his mark well. He was basically the team's offense during his stay and was the main catalyst of the franchise’s surprising resurgence in the past couple of years.

His magical 2016-2017 campaign further endeared him to the Celtics faithful. Isaiah Thomas finished third in the league in scoring (28.9 points per game) and second in fourth quarter points (9.8), en route to leading the Celtics to an Eastern Conference-topping 53-29 record.