"I think Johnson is an excellent player. We're getting a good defender and someone who loves to go forward too, which is something I think Liverpool have perhaps been missing," Jones told liverpoolfc.tv.
"He's got virtually everything to his game and I think that's why the likes of Liverpool and Chelsea were fighting over him.
"Johnson is strong in most areas; he's good at going forward, has good pace, is strong and his defending has really come in the last couple of years.
"He's the all-round right-back and will strengthen the team. It's obvious Rafa rates him very highly.
"When he first went to Chelsea he was perhaps a little bit too young and things didn't work out too well for him.
"However, I've watched him in a few games since he went to Portsmouth and he's played really well and has even been scoring goals.
"I think he's got what it takes to cut it at a top club like Liverpool. He will have learned from his time at Chelsea and is a more experienced player now.
"I believe now is the right time for him to come to club as big as Liverpool."