Two-thirds of Boston’s ‘Big Three’ prospects were together when they found out the trio was about to be made whole again with Roman Anthony getting called up to join the Red Sox on Monday.

“Me and Marcelo were together, actually, we were hitting and we found out,” Kristian Campbell told the Herald before Monday night’s game at Fenway Park, “and we were both super excited, you know, been waiting for this the whole year so far, so it’s exciting times for sure.”

“When I heard, I shot him a text, called him, and just expressed how excited I was for him and that I’d see him soon,” Marcelo Mayer said.

Campbell made the roster out of spring training and debuted on Red Sox Opening Day. Mayer joined him less than two weeks ago, on May 24.

“I think I’m already pretty comfortable,” Mayer said. “Obviously, having, you know, one of my best friends on the team just helps that much more.”

Even Kyle Teel, the top catching prospect from the days when the ‘Big Three’ were the ‘Big Four,’ debuted with White Sox over the weekend.

At last, but certainly not least, it’s Anthony’s turn.

On a team full of young players and rookies, he’ll be the youngest by far. Yet less than a month removed from his 21st birthday on May 13, Anthony goes about his business with a maturity far beyond his years.

“I think he’s really ready,” Campbell said, emphasizing the word ‘really.’ “He’s been ready. I know he’s excited, we’re all excited for him. We’ve been looking forward to this moment.”

“I don’t think I have to really say anything to him,” said Mayer, when asked what advice he’d offer to help ease Anthony’s transition to the big leagues. “He’s a pro. He knows what to do. I know he’s gonna come up here and put in the work and do whatever he can to help the team win.”

With how last-minute Anthony’s call-up was – the WooSox actually delayed their Monday afternoon bus trip to Pennsylvania for this week’s road series while they awaited a decision from the Red Sox – Campbell said he and Mayer hadn’t gotten to spend much time with him yet.

“I talked to him for a second, congratulated him,” Campbell said. “Tried not to overwhelm him too much, but I know he’s excited and ready for what’s to come.”

They’ll have plenty of time together now: on Monday night, Anthony, Campbell, and Mayer were batting fifth, sixth, and seventh in the Red Sox lineup. They’ve come a long way since the last time they were in the same regular-season lineup: last July, when they were still in Double-A Portland.

“It’s been a long time coming,” Mayer said. “I feel like it’s been talked about for a very long time, and it’s kind of crazy that today’s the day that we’re all gonna share the field together in the big leagues.”