The striker, 30, has agreed a two-year deal with the Ibrox outfit which will be effective from September 1 when the club’s transfer embargo comes to an end.
Daly’s move to Ibrox on a Bosman transfer from Dundee United has been mooted for a number of weeks.
And he has revealed there was only place he wanted to play his football once he has spoken to manager McCoist.
Speaking exclusively to RangersTV, Daly said: “I’ve a lot of time for Ally and his coaching staff and to go on to play for them is a big thing.
“When we met for the first time, I could see the passion the manager has for the club and he really wants to drive it forward.
“He spoke to me about the crowds and the club’s history and once we’d had a chat, my mind was basically made up.
“I didn’t really want my agent to speak to any other clubs, I wanted to try to get this deal over the line and thankfully that has happened.
"Having spoken to Ally, there's no doubt where I want to play my football and I'm really excited about what lies ahead.
“I’ve taken a step back in terms of the level of football I’ll be playing but in terms of club size, Rangers are massive.
“There’s a huge fanbase and when the chance came up to come here it was a no-brainer for me. It was a challenge I wanted to take on.”
Daly scored 15 goals for United last season including one in the Scottish Cup against Rangers and two more against Celtic in the semi-finals of the competition.
McCoist has brought him in primarily to play up front although he is adaptable and can operate as a centre-half too.
Daly added: “I think the manager has brought me in first and foremost as a striker but I’m here to play football.
“If that’s at the back as well that’s fine and that obviously adds an extra string to my bow if I can play in two positions.
“It gives the manager options if he’s struggling at centre-back. I’m open to playing anywhere, I just want to play football for Rangers. If that’s at the back of up front I’m happy.”
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