The Phillies are worried that Freddy Galvis may have a pars fracture in his back.

If that's the case, Galvis could miss the rest of the season and at the very least could miss six weeks.

"It's serious," Phillies assistant GM Scott Proefrock told reporters. "It could keep him out for a considerable amount of time

Galvis will undergo further testing this weekend before the Phils settle on what the true diagnosis is.  At that point they will plan a course of action. If he has the fracture, he'll be in a back brace for six weeks which could cause him to miss the rest of the season.

Initially, Galvis was placed on the 15-day disabled list with a lower back strain.

The rookie is hitting .226 with three home runs and 24 RBI while filling in at second base for Chase Utley.  The Phillies called up Mike Fontenot to replace him and he has been getting most of the playing time at second base.

The Phillies sent utility man Pete Orr outright to Triple-A Lehigh Valley which clears a spot on the 40-man roster for a promotion that should be coming shortly.