The Colts placed Phillips (groin) on injured reserve Tuesday.
Phillips suffered a groin injury during Sunday's win against the Jaguars and will now be sidelined for the remainder of the season. He appeared in six games with the Colts, totaling four tackles (one solo).
Phillips is questionable to return to Sunday's game against the Jaguars with a groin injury, Andrew Walker of the Colts' official site reports.
Phillips was promoted from the practice squad in late September and has four total tackles in five games. Tyquan Lewis and Al-Quadin Muhammad are the Colts' remaining options for rotational snaps at defensive end if Phillips remains sidelined.
Phillips was promoted to the Colts' 53-man roster Friday.
Phillips spent most of 2017 on the Jaguars' practice squad, but he was activated for four games to work in a special teams role. The 26-year-old will work in a similar setting with the Colts.
Phillips was promoted to the Jaguars' 53-man roster Saturday, Mike Kaye of FirstCoastNews.com reports.
Phillips has been called up to presumably help provide depth on the defensive line. The rookie will make his NFL debut Sunday versus the Colts.