SAN ANTONIO (AP) Dallas Cowboys rookie Scott Zimmerman, a college linebacker converted to fullback, will be out at least two weeks after spraining an ankle in Friday's victory over Oakland.

Zimmerman is considered the Cowboys' No. 2 fullback behind Robert Thomas.

On Sunday, rookie wide receiver Anthony Lucas went down during practice with what team owner Jerry Jones described as a broken kneecap that will likely end his career.

Lucas was injured during a pass-catching drill that did not involve contact, Jones said.

Lucas was on the Cowboys' practice squad until last October, when he fractured a kneecap. In 2000, after being drafted out of Arkansas by Green Bay, he was lost for the season after having surgery on his right knee.

Reserve fullback Michael Wiley, a third-year player, also sprained an ankle in the Raiders game. Coach Dave Campo said Wiley was regarded as day-to-day, though he could be out as long as a week.

Campo said the loss of the fullbacks could prompt Dallas to try to bring another player into training camp for consideration.

Tackle Char-ron Dorsey didn't practice Sunday because of a strained right calf, but Campo said he was expected to return to the field early this week.

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