The Sixers made a blockbuster deadline day signing when they acquired Harris from LA Clippers.
It means they now have a mouthwatering line-up of four All-Stars which includes Jimmy Butler, Joel Embiid and Ben Simmons.
Sitting fifth in the Eastern Conference, Philadelphia are well placed to go on and cement their playoff position.
They take on the Lakers on Sunday evening – who had a completely contrasting trade window, missing out on Anthony Davis.
And star man James is concerned that the upcoming opponents could possibly have too much firepower.
“They’re going to look a lot different,” LeBron James said.
“They added an All-Star-caliber player who’s playing All-Star basketball this year in Tobias.
“We’re a lot different as well. You know, I was in a suit last time.
“So hopefully I’ll have a great day tomorrow, and I know it’s an early game on Sunday, but I’m looking forward to being in the lineup as well and seeing what we can do.”
James also claimed the Eastern Conference teams are only beefing up their rosters because he is absent from the division after leaving Cleveland Cavaliers at the start of the season.
“Those top teams in the East, yeah, they’re going for it,” he said.
“Toronto is going for it, Milwaukee’s going for it, Philly.
“Boston believes they can do it, too.
“They know they ain’t gotta go through Cleveland anymore.
“Everybody in the East thinks they can get to the Finals because they ain’t gotta go through me.”