The young defender said: “I asked Gary what he thought I should do with regards to it all and he didn’t have a bad word to say about Rangers. He told me I could move forward with Rangers as they were a good club.
“That is what I want to do in my career and I am looking forward to it. I can’t wait to get started now.”
Caldwell worked with Kiernan at Wigan, being named manager at the end of last season to replace Malky Mackay. He could not prevent the Latics being relegated to League One, and Kiernan left the club for £200,000 last week as Caldwell started a restructuring of Wigan.
Rangers signed the young defender, and he has admitted that Caldwell gave him a good understanding of Rangers, as well as speaking positively on the club who he used to face with Celtic.
The 33-year-old moved to Parkhead in 2006, starting his career in poor form before starting to establish himself as a cult hero during the 2007/08 season. He made 150 appearances for the club, captaining them for part of that spell, before leaving for the DW Stadium in 2010.
The former central defender has backed Kiernan to impress with Rangers, and even though he was a long-term rival of the Light Blues, he spoke highly of the club. Should Kiernan have the same kind of impact at Ibrox as Caldwell had at Parkhead, Rangers have just completed a great piece of transfer business.