Rafa Benitez believes Glen Johnson now has the quality and experience to be a star player at a top four club.
The 24-year-old won a title winner's medal at Chelsea earlier in his career before being sold to Portsmouth.
Johnson's time at Fratton Park saw him become England's first-choice right back - and Benitez believes he is now ready to succeed in a side gunning for major honours.
"We are really pleased because we've signed a really good player, an England international," the boss told reporters at Johnson's unveiling on Thursday.
"It's very positive. He has quality and a very good mentality, and from the first time I spoke with him it was clear he wanted to come here.
"He has quality, that's clear. He's more mature - you can see from the press conference he is good.
"Chelsea were trying to win big trophies at the time he was there and they needed experience in order to win. Now it is a good moment because he is a much better player, he has the experience and the desire."
Meanwhile, Benitez confirmed Fabio Aurelio will be out for a maximum of two months with a knee injury sustained over the summer, though the boss is hopeful of having the left-back available within a month.
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