Golden State Warriors forward Otto Porter Jr. left Game 3 with left foot soreness. Cary Edmondson-USA TODAY Sports

Warriors forward Otto Porter Jr. exited the team’s Game 3 win on Sunday night in the second quarter due to what the team is calling left foot soreness, as Kendra Andrews of ESPN writes.

Porter sustained the injury when he landed after a layup attempt. He tried to play through the pain, but was favoring his left foot and had to be subbed out shortly thereafter, at which point he headed to the locker room.

X-rays on Porter’s left foot came back negative, according to Andrews, but it sounds like he’ll undergo more testing on the injury, which head coach Steve Kerr referred to as “definitely concerning” (Twitter link via Anthony Slater of The Athletic). The Warriors said after the game that they expect to know more within the next 24 hours, so it’s possible we’ll get an update by the end of the day on Monday.

A foot injury sidelined Porter for the last game of the Western Conference Semifinals on May 13, but that ailment affected his right foot, not his left, so this is a new injury rather than an aggravation of that one.

Porter has been a key member of Golden State’s rotation during the team’s playoff run this spring, averaging 5.5 PPG, 4.1 RPG and 2.2 APG on .467/.323/.714 shooting in 13 appearances (20.7 MPG). Those averages are diminished slightly due to the two games he left early due to his foot issues.

The Warriors are up 3-0 in the Western Conference Finals vs. the Mavericks, with Game 4 to be played on Tuesday in Dallas.

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