Joe Staley 'very disgusted' by line play

Veteran left tackle Joe Staley says he is ''very disgusted'' by his play and that of the 49ers' offensive line in a 30-7 exhibition loss to Houston on Saturday night.

Staley watched game film Monday and saw again the many times he and his linemates were repeatedly beaten by the Texans' tenacious four-man rush. San Francisco gave up three sacks and coach Jim Harbaugh called for improvement in technique and fundamentals.

Staley, a fifth-year pro who received a $42 million, six-year contract extension in June 2009 to lead this line for the long term, was eager to get back on the practice field because he had a ''bad feeling'' about the game.

The 49ers finish the preseason Thursday night at San Diego.