Jackson still No. 2 QB for Vikes; Childress says 'it would probably be hard for it to change'

Tarvaris Jackson is entrenched as Minnesota's backup to quarterback Brett Favre, despite sharp play in exhibition games this month by Sage Rosenfels.

Coach Brad Childress confirmed Monday that Jackson remains No. 2 and Rosenfels is still No. 3. Childress said he's seen "an evolution" and "a growth" in Jackson since the beginning of training camp.

Asked if the depth chart could change, Childress said "it would probably be hard for it to change."

The Vikings face a difficult decision about how many quarterbacks to keep with the roster cutdown looming this weekend. Rosenfels's $2.6 million salary this season is high for a third-stringer. And in order to put rookie Joe Webb on the practice squad, the Vikings would have to first expose him to waivers.