CINCINNATI — The Cubs’ new third baseman is officially in the building.

Isaac Paredes has reported to the team, was activated and is starting at the hot corner in his Cubs debut against the Reds on Tuesday.

[WATCH: Jed Hoyer’s press conference following the trade deadline]

It was one of a trio of moves after Tuesday’s trade deadline.

The team optioned infielder Miles Mastrobuoni to Triple-A Iowa to make room for Paredes and recalled righty reliever Ethan Roberts from Iowa to fill Mark Leiter Jr.’s spot in the Cubs’ bullpen.

Leiter was traded Tuesday afternoon to the Yankees for minor-league right-handed pitcher Jack Neely and infielder Ben Cowles.

Paredes is hitting 5th in Craig Counsell’s lineup behind DH Cody Bellinger, who is making his first start since suffering a fractured middle finger that landed him on the IL. Bellinger was activated Monday but did not play.

Roberts, 27, has yet to allow a run in 6 innings across 4 games for the Cubs this year. He returned this season from Tommy John surgery that caused him to miss all of 2023.

Mastrobuoni is hitting .200/.255/.233 with 3 RBI and a pair of stolen bases in 98 plate appearances this season.

Complete Cubs trade deadline content:

–Behind the Cubs’ trade deadline strategy – and why Jameson Taillon wasn’t moved
–Cubs players react to trade deadline moves
–Why the Cubs decided to trade Mark Leiter Jr. at the deadline
–A comprehensive look at the Cubs’ 2024 MLB trade deadline moves
–Mark Leiter Jr. shares heartfelt appreciation for Chicago in farewell post
–Cubs trade away Mark Leiter Jr. in deal with Yankees
–In a stunning move, Cubs deal away Christopher Morel in big trade with Rays
–Cubs Weekly Podcast: Breaking down the Cubs’ fascinating – and surprising – deadline moves
–Who is Isaac Paredes? The book on the new Cubs third baseman
–WATCH: Christopher Morel shares emotional farewell with teammates and coaches in Cubs dugout
–Cubs acquire hard-throwing pitcher Nate Pearson