Sunday's game against the Jaguars will be the second game in a row that cornerback Sidney Jones will be missing with a hamstring injury. Howie Roseman has been rumored to be looking for cornerbacks to bring in from other clubs, but right now he had to settle with a minor move to help for Sunday's game in London.
Sullivan spent the preseason with the team, and held his own ground. He didn't play at a high-enough level to make the initial 53-man roster, but he is a solid fill-in option for this week, as he knows the Eagles playbook because of being with the team from April to the end of August.
After this game the Eagles will be on a bye week, and the trade deadline is on Tuesday, October 30th. Howie Roseman will certainly be looking for a cornerback to bring in via trade. Whomever he trades for will have a full week to learn the playbook and be ready to jump right in to make their Eagles debut on November 11th, versus the Dallas Cowboys.