Bulls All-Star shooting guard Jimmy Butler seemed a somber man in Harlem on Monday during the unveiling of the US Olympic Team. Maybe it’s because his Bulls are breaking up — losing point guard Derrick Rose to the Knicks in a blockbuster trade and free-agent starting center Joakim Noah could soon follow.

“Obviously I wish him the best moving forward,’’ said Butler, who didn’t crack a smile on stage or in the media availability afterward. “I know he’s going to help New York win games, man. He’s a hell of a player.’’

Butler has yet to speak to Rose about the trade, but said he thinks he’s still “All-Star’’ caliber. Chemistry issues between the two have been cited as a reason for the breakup.

Has Team USA teammate Carmelo Anthony asked him about Rose? Not yet.

“You already know what guys bring to the table anyway,’’ Butler said. “I know [Carmelo’s] excited. I think [Derrick’s] going to win them games. As excited as I am for [Rose], I got to figure out how to win games in Chicago.”

Butler said the chemistry issue was overblown, and he wasn’t consulted about the trade.

“Above my pay grade,’’ Butler said.

“Just because we didn’t win like everyone expected,’’ he added of the chemistry accusation. “That’s what happens when you don’t win. That’s what you base it on. We’re two very good players.

“We were injured — on and off the floor. Call it whatever you want. We just didn’t get the job done.”

Butler said he knows very little about the Bulls’ new pickup, point guard Jerian Grant, whom the Knicks shipped to Chicago in the deal.

“Now that’s he’s on my team, I’ll learn his game quickly,” Butler said.

At a press conference Monday, Bulls coach Fred Hoiberg called his new center “Brook Lopez’’ instead of Robin Lopez.