Angels pitcher Garrett Richards is scheduled to fly back to Los Angeles on Thursday to be examined by team doctors for what manager Mike Scioscia called a "significant injury" to his left patellar tendon.

Richards sustained the injury Wednesday night against the Red Sox while covering first base in the second inning. First baseman Albert Pujols had fielded a ground ball by Brock Holt and thrown to second for a force play with Boston runners on first and second. Richards never made it to the bag, as he fell to the ground, clutching his left knee in pain.

"Obviously he's very distraught," Scioscia said after the Angels' 8-3 win. "He knows that it's not good, and we'll get some direction from our medical staff."

Scioscia refused to speculate on whether Richards is lost for the rest of the season, but teammate Jered Weaver said a tearful Richards, before he was taken to Massachusetts General Hospital, was told in the trainers room that he might require surgery. A torn patellar tendon almost always requires surgery and involves a recovery of at least three to six months.

"When I saw him go down," said Angels designated hitter Mike Trout, who has roomed with Richards since they were together in Double-A, "I got sick to my stomach."

When Angels shortstop Erick Aybar took Pujols' throw at second, he pivoted and threw to third base in an attempt to get the lead runner, which drew the attention of the Angels in the dugout away from first base.