"He was an idol of mine and I watched him when I was younger when I used to go and watch all the Irish games," said Doyle to the CT.
"But that whole team was great for Irish football when they started to qualify for tournaments from Euro '88 to Italia '90 and USA '94, which was Keane's first big tournament when we beat Italy.
"I am a bit surprised to see him at Ipswich but it is a massive club and they are getting good investment and it is obviously an attractive place for him to go to. "They have outstanding facilities as well so it is an attractive club.
"They did well in the Premier League for a couple of years and I am sure they feel that's where they belong, and they are making a bit of a statement by appointing Roy Keane who they will think is going to take them there.
"Everyone knows what his standards are and he's not going there to be second best. "He'll be going there looking to win this league next season."
City travel to Portman Road on Sunday. Tickets are priced at £28 for adults, £19.50 for senior citizens (over 60), NUS card holders and 16-19 year-olds, and £10 for under 16s.
There are also 10 available spaces for wheelchair-using supporters with personal assistants for £16.50. Ambulant-disabled supporters can also use personal assistant spaces at £16.50 per supporters and personal assistant together. Disabled supporters will have to collect their tickets from Ipswich Town on the day.
For further information please contact Ipswich Town on 01473 400556. Five disabled parking spaces are available for booking using the same phone number.