Kyrie Irving's latest shoulder injury reportedly has the Cleveland Cavaliers concerned.  A new report, meanwhile, indicated free agent Ray Allen is more likely to retire than to sign with Cleveland.

Irving left the Golden State game Thursday night and did not return after injuring his left shoulder.  An MRI later confirmed Irving had a strained left shoulder, according to the Associated Press, and the Cavaliers subsequently ruled him out for Friday's game against Indiana.

Despite Irving's injury only being a strain, the team reportedly is still concerned.

"(Cavaliers) are concerned about the injury because he's been injured in that shoulder before," ESPN Cleveland tweeted Friday on behalf of reporter Brian Windhorst.

Irving has stayed healthy for most of this season, missing only three games compared to the 49 games he missed in his first three seasons.  It's uncertain how long Irving will be sidelined; he's scheduled to be reevaluated before Sunday's game against Houston.

As for Allen, a report from Windhorst paints it as unlikely he signs with Cleveland this year.

"Ray Allen is not gonna sign with the Cavs.  I don't think he's gonna play.  If he decides he wants to, it won't be with the Cavs," Windhorst said, according to a tweet from ESPN.

Allen was expected to take phone calls in January and sign with a team sometime in February, but that hasn't happened yet.  With the postseason getting closer, it seems less and less likely Allen will return for what would be his 19th season.  Teams reportedly interested in him include the Los Angeles Clippers, the Washington Wizards and the San Antonio Spurs.