OXNARD, Calif. -- Dallas Cowboys defensive tackle Jay Ratliff suffered a minor hamstring strain during a conditioning test this weekend, an MRI revealed on Sunday.

Ratliff was placed on the physically unable to perform list Sunday morning. The four-time Pro Bowler was able to finish the conditioning test on Saturday, but was hurt in the middle of the run that led the team to placing him on PUP.

"We'll evaluate [the MRI] and make our best decision with him," Cowboys coach Jason Garrett said.

Ratliff missed most of training camp last year because of plantar fasciitis and missed 10 games with ankle and eventual sports hernia surgery last season.

In their move to the 4-3 defense, the Cowboys need Ratliff to play a big role. However, the 31-year-old has had his sack totals decrease in each of the last five seasons.

"He's working through some things and we'll handle that," Cowboys executive vice president Stephen Jones said. "I'm not concerned."

Guard Mackenzy Bernadeau, who had offseason shoulder surgery and did not take part in the organized team activities and minicamp in the spring, also hurt his hamstring during the conditioning test and was placed on PUP. He will not have an MRI.

Bernadeau said he felt the strain on the 15th of 20 40-yard dashes he had to finish in six seconds each and felt it would be better not to aggravate it further by continuing to run.

It is the second straight year Bernadeau has not been able to practice at the start of camp because of injury. He missed most of training camp last year with knee and hip injuries but managed to start every game.