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.

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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