Coulibaly was on Tuesday unveiled as a Rangers player on a season loan deal from French League 1 side Angers.
With Gerrard at the other end of the line inviting him to join Rangers, an awestruck Coulibaly first thought the call was a hoax before agreeing to a loan move at Ibrox.
“I am very happy to be here,” Coulibaly told Rangers TV.
“When my agent told me Steven Gerrard is the head coach, I said, OK ‘no problem’ and I was happy to come and join this team.
“Yes (Gerrard was the big reason why I joined Rangers) so that he can help me to develop my football. He just asked me whether if I wanted to join his team or not and I said yes. First I said maybe it was not Steven Gerrard. I was worried it wasn’t actually Gerrard (on the phone). When he was at Liverpool, I grew up watching him.
“I am a midfielder and I am physically strong. I like to try and go and win the ball back for my team. I want to do something here and in years to come, the fans will talk about it.
“I think playing for a big team is nice as everyone wants to play for the big teams.”
Capped nine times by Mali, Coulibaly will be part of a cast of players expected to star in Gerrard’s first top-flight football managerial test.