Giants rookie left tackle Ereck Flowers sat out Monday's practice with a sore hip flexor, but head coach Tom Coughlin does not think the injury is too severe.

"He doesn't seem to be bad," Coughlin said after the practice. "This morning he was sore but by the time I caught him in the meeting room he was doing this [swinging his leg]. Hopefully it's just a short amount of time."

The Giants are calling Flowers day-to-day. Coughlin said the injury occurred a few days ago and Flowers tried to play through it.

With Flowers out, the Giants had Justin Pugh slide from left guard to left tackle. That's the position he played in college before he was drafted by the Giants and was moved to right tackle for two seasons. This is Pugh's first season working at guard, although Jerry Reese mentioned him on Sunday as part of the team's depth at tackle.

"We thought today would be a good day to put him at left tackle," Coughlin said of Pugh. "His versatility, he's a smart player, it's helpful."

The Giants also gave Geoff Schwartz, who returned to practice after missing Sunday, a handful of reps at right tackle along with his usual ones at right guard. Adam Gettis took Pugh's spot at left guard with the starters.

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Coughlin seemed happy to be able to tinker and get different players different looks at different positions. Ultimately, though, he made it clear how vital Flowers is to the offense and the importance of getting him back healthy.

"He's a first-round draft choice," Coughlin said. "The left tackle from last year [Will Beatty] tore a pec. He's out there trying to learn how to play. He's important."