Greg Rutherford has expressed his disappointment at finishing third in the long jump at the Diamond League meeting in Birmingham on Sunday.
Aleksandr Menkov of Russia finished first with a distance of 8.18m at the Alexander Stadium, followed by American athlete Christian Taylor.
"I felt good going into the jump, until I got into the pit after my first jump when I felt a bit of a twinge in my groin and maybe I was a bit silly to carry on," said Rutherford.
"I thrive off the thought of people gunning for me, I came here feeling good, albeit a bit lethargic following the events of the last few weeks.
"But I'm a professional athlete, I should be able to come out here and perform. I feel like I let a few people down today."
Rutherford won gold in the long jump at the 2012 London Olympics.