On Tuesday, Sept. 17, the former NFL fullback, 31, announced that he and his wife Gabriella are expecting their third baby together, sharing the exciting news in a joint Instagram post.

“Here we grow again!” the couple wrote. “We are beyond excited to be adding another little one to our family in April! The boys can’t wait to find out if they’re going to have a baby brother or a baby sister… 🩵🩷.”

In a sweet black-and-white snap, the couple’s sons — Brayden, 3, and Logan, 5 — stand behind a wired fence at a baseball field with their backs to the camera, showing baseball jerseys that include their names and birth order. The siblings also rock baseball hats that are adorned with “Big Bro Club” patches.

Next to the two toddler boys, another jersey hangs from the fence, with the words “on deck” stitched on the back and a number 3. A sonogram strip hangs beside the shirt and a mini baseball bat and glove sit below.

Derek’s big brother J.J. Watt shared his excitement for his little brother in the comment section, writing, “LET’S GOOOOOO!!!!!!!!”

The soon-to-be dad of three’s younger brother T.J. Watt also shared a comment, leaving a simple red heart emoji and reposting the picture to his own Instagram Story.

J.J., Derek and T.J. all began their football careers in their hometown of Pewaukee, Wisconsin, playing in high school and later in college at the University of Wisconsin-Madison. All three brothers have since made their way to the NFL, racking up multiple accolades and major contracts during their time in the league.

In October 2023, J.J., who retired from the NFL after the preceding season, was honored by the Houston Texans with a spot in the team’s Ring of Honor during halftime at the team’s faceoff against the Pittsburgh Steelers at NRG Stadium.

The stadium erupted into cheers for the iconic defensive end who held his then-10-month-old son Koa in his arm. Koa was dressed in a Watt jersey with sound-canceling headphones on as he looked around and took in the sights.

JJ and wife Kealia recently caught up with PEOPLE, sharing that Koa is already taking an interest in sports. “I imagine we’ll be coaching in some capacity in the future,” JJ said, adding that his favorite toy this summer has been a soccer ball.