Kenya international Victor Wanyama moved to the Premier League from Celtic after being linked with several of the top clubs, but it was Southampton who got the player's signature first.
And Wanyama, who was bought for £12.5m, has thanked Celtic for the two good years he spent in Scotland, while he also claimed that he found it hard to leave the Bhoys.
Wanyama told Sky Sports: "It has been hard. Celtic have been good to me and the fans have been great. To be honest it was hard leaving them, but I wish them all the best.
"I had a good time with them. I want to thank them for the time I was there and hopefully one day we will be back.
"I think Celtic have played a big part in my improvement and I want to thank the manager and the players. It was really good and I enjoyed it."
About his move to Southampton, he added: "I'm excited. It's a new challenge and I'm looking forward to it.
"I need to go and work hard and try to get in the team. We will see what happens from there."
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