The Welsh coach was already at the Swans when Rodgers arrived as boss in 2010 and the duo quickly formed a strong bond.
Rodgers told the Liverpool Echo: "When I went into Swansea, I went in on my own.
"I felt that I probably diluted myself too much during my short time in charge at Reading.
"I needed to get back to taking the sessions and doing the work, but obviously you need capable assistants to work with you.
"I felt going to Swansea I needed people who shared the vision and the ideas.
"Colin had worked there under a few managers from Kenny Jackett to Roberto Martinez and Paulo Sousa. He had a clear identity with the Swansea ideas.
"I did my homework on him and found that he was a loyal, honest man. He was an attacking coach who was keen to work in this way. He understood the philosophy.
"I had no doubts about bringing Colin to Liverpool. He's a wonderful co-ordinator between the players and myself.
"I work closely with players. I talk and communicate with them a lot and Colin offers great support on that front. They respect him."
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