Updated, 1:16 p.m.: General Manager George McPhee said that Mike Green is expected to join the Capitals in Colorado later this week after the defenseman met with a specialist about the lingering right groin muscle strain that has kept him out of 15 consecutive games.

McPhee also acknowledged that Green’s absence has been longer than anyone anticipated back when the defenseman suffered the injury on Nov. 11 in the first period of a game against the New Jersey Devils.

“It’s longer than we expected, unfortunately, but it was a significant injury,” McPhee said in a one-on-one interview with The Post. “It’s a groin injury and those things, they’re hard to heal quickly and know when – you just don’t know when you’re going to be ready.”

Last Thursday, Green came off the ice and slammed his stick into the boards in apparent frustration, having possibly suffered a setback. The incident prompted the Capitals to seek another method of approach to Green’s recovery.

“He’ll be joining the club on the trip,” McPhee said. “We just sent him to see somebody that might be able to help, we’re not sure [if it will]. Hopefully when he joins the club on the road he’ll be skating with the club – getting closer.

“He was progressing then sort of plateaued,” McPhee said. “We thought we would try something else. Don’t know if it will make a difference but we’ll know more in a couple of days.”

The two-time Norris Trophy finalist has now missed 21 of the past 22 contests with absences due to the groin injury and a twisted right ankle that held him out for six games from Oct. 27 through Nov. 8.

Mike Green visits specialist for groin injury