Rumors continue to swirl that Tom Selleck could make a cameo appearance on Boston Blue, but series star Mika Amonsen isn’t giving away any secrets.
Speaking with Page Six, Amonsen—who plays Sean Reagan, the grandson of Selleck’s iconic Blue Bloods character Frank Reagan—said he has never met or spoken with the veteran actor. However, he acknowledged that the possibility of a cameo has at least been discussed.
“That conversation was definitely there, for sure,” Amonsen teased, without revealing whether anything is officially in the works.
Selleck has previously been vocal about his disappointment over CBS canceling Blue Bloods in 2024 and has also expressed hesitation about appearing in the spinoff. Even so, fans continue to hope Frank Reagan could eventually make an appearance.
“There’s a lot of fans that want to see it happen and there’s speculation,” Amonsen said, while noting that cast members who worked closely with Selleck—particularly Donnie Wahlberg—are in a much better position to know whether a return could happen.
“I would just be happy he was there,” Amonsen added. “I know how much fans want him to be on the show.”
Boston Blue follows former NYPD detective Danny Reagan (Wahlberg) and his son Sean (Amonsen) as they begin a new chapter with the Boston Police Department after leaving New York behind. The series serves as a continuation of the Blue Bloods universe, which ran for 14 seasons from 2010 to 2024 and centered on the Reagan family, led by New York City Police Commissioner Frank Reagan, played by Selleck.
Amonsen also addressed taking over the role of Sean Reagan from longtime Blue Bloods actor Andrew Terraciano. While some fans initially questioned the recasting, the actor said he never let the online criticism get to him—even after Wahlberg advised him to stay away from Reddit.
“He’d be like, ‘It’s gonna affect you!'” Amonsen recalled. “It doesn’t affect me at all. I’m like, ‘Oh, whatever.’ What can you do? There was a lot of positive reinforcement underneath those postings, so it never bothered me.”
Although he hasn’t spoken with Terraciano directly, Amonsen said Wahlberg has remained in contact with his former on-screen son.
“I haven’t been in communication with him. I know Donnie has,” Amonsen said. “Through broken telephone and a degree apart, I’m sure we’ve heard each other’s sentiments.”
Off camera, Amonsen says he and Wahlberg have developed a close bond, describing the actor as both a mentor and a leader.
“He’s been great to me,” Amonsen said. “It’s more just watching him and gathering an understanding of how he conducts himself as a leader and a producer.”
As a first-time series regular, Amonsen has also had to adjust to the physical demands of starring in a police procedural. Early in production, he suffered a wrist injury and hurt his shoulder while filming an action sequence.
“My boot came undone and I tripped and really ate it,” he explained. “We’re running, we’re tackling. We’re doing all sorts of stuff, so it’s bound to happen.”
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