The England international had felt unwell when the club travelled to Spain on Wednesday, but he recovered in time to train on Thursday.
Manager Jurgen Klopp was hoping to see him come through the training camp unscathed but he has now been forced to return to England due to a virus.
He was assessed by the club's medical staff and will now recover back in the UK.
Despite seeing Sturridge leave, captain Jordan Henderson insists the trip will help the Reds kick on in the remainder of the season.
He told reporters: "It's a different environment and you're with each other 24/7, so I think that'll only benefit us as a team going into the last part of the season.
"We can get a lot of work in on the training pitch on what we need to improve on, and everyone is looking forward to it."
He added: "Hopefully the sun will help and we'll be feeling refreshed in the training, so hopefully when we go back home we're recharged and ready to go."