Warriors guard Nick Young was diagnosed with a concussion after leaving Monday night's 111-104 win over Portland in the third quarter. Midway through the third, Young was inadvertently hit in the head by Jordan Bell and crumpled to the floor. He didn't not return after heading to the locker room after the next possession. Young, who finished with 12 points on 5-for-8 shooting in 13 minutes, will enter the NBA's concussion protocol Tuesday. Connor Letourneau is a San Francisco Chronicle staff writer. Email: cletourneau@sfchronicle.com. Twitter: @Con_Chron