When Jordan Henderson made way for Joe Allen in the 71st minute and then immediately headed for the locker room, Liverpool fans could have justifiably feared the worst. The captain has been dealing with pain related to plantar fasciitis for most of the season, and has yet to regain his pre-injury form.
However, Henderson's substitution had nothing to do with his on-going foot issue, and everything to do with his momentary stomach illness.
"No, he is ill," Klopp explained in his post match interview. "Can I use the word vomiting? At half time he did this so we asked if he was okay and he said yes. But it was clear [there was something wrong]."
Klopp elaborated in the post match press conference.
"In halftime he [vomited], but then [he] said, 'I feel better.' I think everyone knows this feeling."
Henderson was apparently quick to vacate the premises. When asked how the Liverpool captain was after the match, Klopp responded:
"I'm not sure, he was not in the dressing room anymore, maybe he is in the bus."
If he didn't show up there, be sure to check behind the couch. You definitely don't want to leave any Hendos behind at Old Trafford.
One of the potential factors for leaving Henderson on to start the second half was the match-up problem posed by Manchester United midfielder and elbow enthusiast Marouane Fellaini. The manager briefly mentioned this in the interviews, but did not elaborate on whether this was his decision or Henderson's.
There's no word yet as to whether Hendo will be able to go against Southampton on Sunday. Hopefully it's a quick recovery for the captain.