Iman Shumpert says he's focused on contributing in any possible way to help the Cavaliers take Game 3 in Cleveland. (0:48)

OAKLAND, Calif. -- Cleveland Cavaliers guard Iman Shumpert experienced cramping in the second half of the Cavs' 132-113 Game 2 loss to the Golden State Warriors in the NBA Finals on Sunday and required intravenous fluids after the game, a team source told ESPN.

Shumpert had six points, four rebounds and three steals in 22 minutes off the bench, and despite shooting only 1-for-6 from the field, he was considered a bright spot in the loss because of his attack mentality and on-ball defense against Kevin Durant.

Even with the cramping, Shumpert's play, coupled with JR Smith's disappearing act in the series thus far, has the Cavs considering a lineup change at shooting guard for Game 3, the source said.

The Cavs' coaching staff encouraged Smith to be more aggressive on the offensive end after a Game 1 loss in which he had just three points on 1-for-4 shooting in 28 minutes. But he was even less effective in Game 2. He finished with zero points on 0-for-2 shooting and four fouls in 14 minutes, netting a plus-minus of minus-18, tied with Tristan Thompson for worst on the team.

Cavs coach Tyronn Lue said the Cavs must improve their defense, above all else, to give themselves a chance in Game 3 on Wednesday.

"I think that having awareness, can't relax, can't fall asleep," Lue said. "This team, their offense is constant movement, so you got to be locked in. You can't take a peek somewhere else and lose your man. So they make you pay. And they have a lot of guys who are great passers, so you got to be alert at all times."