DAVIE (CBSMiami) – If you’re looking for a Miami Dolphins rookie who may make an immediate impact on the team, you might want to focus on fifth-round draft pick Mike Gillislee out of the University of Florida.

The former Gator reportedly looked good in his first day of rookie mini-camp and that’s good news for a team that let its top rusher leave in free agency.

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“It looked like he had some good burst out there today and he’s picked up the offense relatively well so far. I thought he did a good job,” Dolphins head coach Joe Philbin said after practice Friday.

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Gillislee comes into a backfield that features projected starter Lamar Miller and backup Daniel Thomas. The rookie could push Thomas for backup duty or even give Miller a run for his money if Gillislee’s pass blocking is up to speed.

“All of our jobs are open, certainly,” Philbin said. “I wouldn’t rule it (Gillislee starting) out.”

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Last year for the Gators, Gillislee ran the ball 244 times for 1,152 yards and 10 touchdowns. He also caught 16 passes for 159 yards and one touchdown in 2012. Combined Miller and Thomas ran for 575 yards and five touchdowns for the Dolphins in 2012.