Poulter withdrew from the AT&T Byron Nelson Championship on Wednesday, tweeting that the decision was a precaution after he suffered a strain during a workout earlier this week:
I will not be competing this week in Texas, I picked up a slight strain in the Gym on Monday, so taking precautions and not chancing it.— Ian Poulter (@IanJamesPoulter) May 27, 2015
Poulter is in the midst of a strong season, and he played in Sunday's final group at the Crowne Plaza Invitational before finishing T-5. The Englishman has eight top-25 finishes in 12 starts this season, and he hasn't finished outside the top 30 in his last six stroke-play starts.
Poulter tweeted earlier in the week that this would be his final "regular" PGA Tour event of the season, meaning he will only tee it up in the U.S. during majors, FedEx Cup playoff events and the WGC-Bridgestone Invitational. His next start will be at the U.S. Open.
Brandt Jobe, who entered the day as first alternate in Texas, is expected to replace Poulter in the field.