Sunday's game will mark the third consecutive start for Davis, who debuted during the team's Week 1 game after starter Shaun Hill was knocked out with a quad injury.
Rams head coach Jeff Fisher has said that Hill will start for the Rams when he regains his health.
Davis, currently in his third NFL season, had not played a snap prior to this season. In three games so far this year -- including two starts -- Davis has thrown for 754 yards and three touchdowns with three interceptions. He is completing 72 percent of his passes.
The Rams, 1-2 overall, are 1-1 in Davis' starts so far this season. St. Louis is coming off a bye week as it prepares for the Eagles, who are currently 3-1.
- Stanley Kay