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Bubble players to watch in 49ers’ final preseason game

The San Francisco 49ers are back at Levi’s Stadium on Thursday to compete in their final preseason game against the Los Angeles Chargers. With the third “dress rehearsal” game in the books, the fourth exhibition is typically reserved for players who are either on the roster bubble or are on the outside looking in. The vast majority of starters won’t see the field. The 49ers’ roster features competition at several position groups. Thursday is many players’ last chance to prove they belong on the team’s final 53-man roster.

Here are players to watch when the 49ers battle the Chargers in the team’s final preseason game:

Second-string quarterbacks

Until one of them is cut or traded, the battle for the backup role between Nick Mullens and C.