The Redskins are preparing to start veteran Rex Grossman at quarterback in Sunday’s opener against the New York Giants, according to reports from and the NFL Network.

Coach Mike Shanahan’s decision, made as the Redskins prepare for their first practice of the week, would give the job to Grossman over John Beck, the fifth-year player who Shanahan believes has superior athletic ability. But even as all signs pointed to Beck as Shanahan’s preferred starter, the coach pledged to hold an open competition during training camp, when each quarterback made three preseason appearances.

Grossman, 31, replaced Donovan McNabb as the starter with three games remaining in the 2010 season, his first starts since 2008 with Chicago. He completed 74 of 133 passes for 884 yards with seven touchdowns and four interceptions. His quarterback rating was 81.2.

The Redskins practice at 2:45 p.m. Shanahan will address reporters afterward.