Rodgers was questioned by reporters at Melwood on what prompted his interest in the Chelsea man and where the attacker is likely to fit into the set-up at Anfield.
He said: "In terms of this summer, it was probably unexpected for him. He's a player that has got experience - he's 24 years of age and became available for us.
"It's a unique opportunity for him; he's leaving a very good club, that has been successful, and he's coming to one of the biggest clubs in the world.
"There are not many players that get a chance to do that. He's coming here to prove himself.
"Everything was set up for him to come to Chelsea at the time and for whatever reason it fell through and he stayed. It probably ended up as the right thing for him, he stayed at Palace, got in the first team, got his move and eventually went there.
"I knew him from that period when I was there as a youth coach. I know what I'm getting. He's got the profile that suits our game in terms of his technique, his quality and he's a humble guy.
"He had some good performances for Nigeria when he was away. He's really looking forward to getting on a Liverpool shirt."
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