The popular defender has signed a new three-year deal with the club after returning from injury.
The 23-year-old enjoyed a breakthrough season on Merseyside in 2013-14, making 23 Premier League appearances and becoming a fan favourite at Anfield.
However, the full-back did not play a single minute of competitive football for the club last season due to injury, and only returned to full training in December of this campaign after being handed a 12-month extension to continue his rehabilitation.
Flanagan made his first competitive appearance in 19 months when he returned in the FA Cup win over Exeter City in mid-January, and he has been rewarded for his impressive displays since his return with a new deal.
The born and bred Liverpudlian is a hugely popular figure at Anfield, with his passionate and energetic displays and praise from legendary Brazilian full-back Cafu earning him the nickname "the Scouse Cafu" amongst the club's supporters.
Unsurprisingly, then, the news of his new deal was met with an overwhelmingly positive reaction from the Liverpool faithful, with many tipping him to become a key performer for the club in defence for years to come.
Here are some of the best tweets in reaction to the announcement:
Well, that was unanimous.