"Sakho is a top, top centre-half and that adds to the great centre-back pairings that we have already and it will give that depth," Ayre said.
"He's an important marquee signing for us. It was a difficult one for us to get, but I'm very pleased that we've been able to attract him to the football club.
"One of the things that Brendan said was that he wanted to add real depth and strength and Sakho is a Champions League player of great pedigree and experience.
"I think it's difficult to imagine anyone filling Jamie Carragher's shoes, but what the arrival will do is bring huge strength and experience to the squad.
"I think importantly, when you see him on the pitch, you see that he's a leader and he's very strong."
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