iverpool's highly-rated young defender John Flanagan has signed a new long-term contract at Anfield ahead of the new campaign.[LNB] Flanagan, 18, made seven appearances at the end of the 2010-11 season after being given a chance by manager Kenny Dalglish.[LNB]And Liverpool director of football Damien Comolli is confident the full-back will justify the faith shown in him.[LNB]Comolli told liverpoolfc.tv: "The first thing everyone will say is he deserves it because he did so well for us towards the end of last season.[LNB]"Flanno had a long time left on his current deal but we felt it was the right thing to do, to reward him for what he's done.[LNB]"His attitude is absolutely terrific. As you see him on the pitch - committed, dedicated, the intensity of his game - is what he's like off the pitch. He's very professional, he knows how to look after himself and who to listen to, and I think that's why he's improved so quickly.[LNB]"He's only 18 years old and he's still got so much room for improvement in every area of his game - but he's already very good going forward, technically he's very sound. I'm sure in two years' time we'll talk about him having made even bigger progress.[LNB]"We're really looking forward to his development and seeing how he's going to do."