SANTA CLARA >> Brock Purdy’s bruised throwing elbow will keep him out of the 49ers’ season finale Sunday at Arizona, but coach Kyle Shanahan relayed a positive word Tuesday about his quarterback’s long-term prognosis.

“He’s most likely going to miss this week but no long-term issues. The UCL is fine,” coach Kyle Shanahan said Tuesday morning on a conference call with reporters.

Purdy, two years removed from an ulnar collateral ligament repair, sustained what Shanahan termed Tuesday as an elbow contusion with nerve inflammation, which sent a darting pain through his arm in the 49ers’ 40-34 loss Monday night in their home finale against the Detroit Lions.

“I’m relieved but I wasn’t too worried about it with the information we had on it last night,” Shanahan added. “Good to hear the same thing today.”

Shanahan said he would decide later Tuesday whether to start Josh Dobbs or Brandon Allen in Sunday’s closing act at Arizona.

Two years ago, Purdy tore the UCL in his right elbow when struck on a first-series sack in the NFC Championship Game loss at Philadelphia. He underwent an internal brace repair in March 2023, resumed throwing three months later, and went on to pass for a franchise-record 4,280 yards last season, en route to his first Pro Bowl honors and a fourth-place finish in NFL MVP voting.

Purdy was injured Monday on a sack with 1:36 remaining, initially dropped by safety Brian Branch for a 7-yard loss before 300-pound defensive lineman Pat O’Connor’s right hand and facemask piled into Purdy’s elbow. Purdy headed to the sideline, winced as the 49ers’ medical staff inspected him, and after exchanging light handshakes postgame with opponents at midfield, he tucked his right hand into his hip-pocket warmer for an awkward-looking jog into the locker room.