INDEPENDENCE, Ohio -- Cavs All-Star forward Kevin Love will get a second opinion on his ailing left knee Tuesday, and there is concern team wide that he could be in line for an extended absence.

"I would love to be able to tell you that he'll miss three games and be back, but I can't right now because we don't know," general manager David Griffin said.

The Cavs have already ruled Love out for Tuesday's game in Minnesota. They play again Wednesday at home against Indiana, and then Love is supposed to play in the All-Star Game Sunday in New Orleans.

Love already underwent an MRI on Sunday, after complaining of pain during and after Cleveland's 125-109 win over the Denver Nuggets Saturday night. The Cavs did not announce the results of the MRI, nor would they share with whom Love would consult Tuesday.

Obviously, the need for more tests and more sets of eyes suggests whatever the Cavs' doctor saw Sunday in Love's knee wasn't optimal.

Sources said Love likely suffered the injury -- whatever it is -- at some point during the Cavs' recent four-game swing. It's unclear when he hurt the knee or when team officials learned of the injury, but Love played in Thursday's loss to Oklahoma City.

It was the Cavs' third game in four nights, fourth in six, and the night before coach Tyronn Lue said Love, Kyrie Irving, and LeBron James "probably" wouldn't play. All three of them played against the Thunder, and again in Saturday's win.

Love scored 16 points and grabbed nine rebounds against the Nuggets.

Lue said he was "definitely concerned" about Love's knee.

"Always concerned when guys are going down," Lue said. "And we're already limited as it is. Definitely concerned, but gotta see how he feels. Just, get evaluated tomorrow and see how he feels."

Starting shooting guard Iman Shumpert (sprained left ankle) is listed as questionable to play against the Timberwolves, and J.R. Smith (the original starting shooting guard) will have his surgically repaired right thumb re-examined during the All-Star break to establish a timeline for his return.

On Monday, the Cavs traded Chris "Bird Man" Andersen and freed up a roster spot, but the team is not expected to immediately sign a free agent.

Love is averaging 20 points and 11.1 rebounds in 46 games (so he's missed seven). This was his fourth All-Star selection. He's already battled food poisoning and a lower back issue.

Lue said Channing Frye would start for Love against the Timberwolves.

James, Irving, and Tristan Thompson were all given the day off from practice Monday, Lue said, but will play against Minnesota.