An unspecified setback regarding the surgically repaired left knee of Los Angeles Angels star Mike Trout has muddled a timetable for his return.

Trout, who is enduring his fourth season of significant time lost to injury, is being sent to have a further evaluation on his knee, Angels general manager Perry Minasian said, per the Orange County Register.

The 32-year-old Trout, a three-time American League MVP, had surgery on the knee in early May to repair a torn meniscus. He was unable to figure out how he hurt the knee.

During a rehab game on July 23 while playing for Triple-A Salt Lake, the 11-time All-Star left after two innings with soreness in the knee.

Asked Tuesday for further details about Trout’s injury status, Minasian said he was “not going to get into details. He had a setback.”

Trout was batting .220 with 10 homers and 14 RBIs in 29 games this season. He is a career .299 hitter with 378 home runs, 954 RBIs, 1,123 runs scored and 212 stolen bases.

Also, the Angels placed oft-injured third baseman Anthony Rendon on the 10-day injured list on Tuesday — with lower back inflammation. The move is retroactive to Saturday.

“Obviously these two guys, they’ve been banged up and I understand that they’re both disappointed,” Minsasian said. ” They both want to play. It’s unfortunate, but it is what it is. We’ll just keep going.”

The Angels are in fourth place in the American League West and are buried in the wild-card standings. They dealt closer Carlos Estevez and fellow reliever Luis Garcia at the trade deadline.

–Field Level Media