SANTA CLARA — The possibilities swirl around Junior Bergen like gunners on kick coverage, but he has only one thing on his mind.

Catch the ball.

“You don’t have a play if you don’t catch the ball,” Bergen said Tuesday after the 49ers finished practice a day before departing for Las Vegas and a joint practice session with the Raiders.

Sounds simplistic, but as a rookie seventh-round draft pick out of Montana, taking time to figure out the numbers game that produces a 53-man roster would only distract Bergen from working on his speciality while also learning a new offense as a wide receiver.

Exhibition games give young players a chance to play some actual football, but even more so for a return specialist. Bergen has dodged large silver balls rolled in his direction as he settles under a

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