Three exhibitions down and there's been no movement in guard Alex Boone's contract holdout with the 49ers, a source indicated Monday.

Joe Looney has started all three exhibitions at right guard in place of Boone. Looney did not allow a quarterback pressure for the second straight week and earned a plus-1.3 grade by ProFootballFocus.com.

Colin Kaepernick endured at least four hits in his four series Sunday, including a sack and a hit allowed by starting left guard Mike Iupati.

The offensive line's depth will be tested further after Sunday's injury to rookie center Marcus Martin, who may have sustained a dislocated kneecap.

San Francisco 49ers’ starting quarterback Colin Kaepernick (7) is congratulated by San Francisco 49ers’ Alex Boone (75) after
San Francisco 49ers' starting quarterback Colin Kaepernick (7) is congratulated by San Francisco 49ers' Alex Boone (75) after Kaepernick's touchdown run against the Atlanta Falcons in the fourth quarter at Candlestick Park in San Francisco, Calif. on Monday, Dec. 23, 2013. (Nhat V. Meyer/Bay Area News Group) ( Nhat V. Meyer )

Boone has two seasons remaining on a contract he signed in December 2011 when he was a reserve. He's the 43rd-highest paid guard, and is slated to make $2 million and $1.2 million in base salaries the next two seasons.

Boone was placed on the reserve/did-not-report list at the start of training camp July 23. The 49ers must trim their roster to 75 by 1 p.m. Tuesday.

For more on the 49ers, see Cam Inman's Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.



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