Henderson has flown to Miami along with Adam Lallana as the English duo seek to recover from their respective injuries.
Lallana was ruled out for at least four weeks after picking up a thigh problem while on international duty last week.
Henderson, meanwhile, had returned to training and Jurgen Klopp had expected to have him back available against Everton – but the manager then said in his pre-match press conference that his captain had “a little setback.”
“I can’t say how long [until he’s back],” said Klopp on Friday.
“We can’t take a risk. It’s always too long with injuries. It’s not the best time, but nothing else to do. We’ll wait for the moment when he’s back again.”
The absence of the two key midfielders leaves Liverpool pretty short in midfield, but the trio of Lucas Leiva, Emre Can and Georginio Wijnaldum performed well against Everton and will now be needed to do so again in these upcoming games.
Bizarrely, the Liverpool Echo claims that Lallana and Henderson’s trip to Miami is not for medical treatment but “more a change of scenery” – which seems pretty strange, to say the least.
Henderson has missed the last five games, with what was initially claimed to only be a brusied foot.
Meanwhile, Liverpool wait with bated breath for news on Sadio Mane‘s injury.