He has signed a two-year deal and said: "It’s a big honour and a privilege to sign for a club this size, but it’s also a big responsibility in my opinion because you have to be the best you can.
“You have to win trophies and it’s something I’m really looking forward to.
“That’s why I mentioned the word ‘responsibility’, because I think everyone who signs for this club has to know what they are in for.
"You have to win everything that comes your way and I’m really looking forward to that challenge and for that responsibility.”
Kranjcar, 31, is the third Croatian to join the club after Dad Prso and Nikica Jelavic.
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Mark Warburton continues his summer business with his sixth signing
Boss Mark Warburton said: “We are delighted to secure a player of Niko’s undoubted qualities and very much look forward to welcoming him to the club.
“Such a signing shows our desire to achieve a positive balance between young, hungry players and the undoubted necessity of experience and maturity.
“In addition, I would like to thank the Cosmos for the highly professional manner in which they have conducted their business throughout this process. It has been a pleasure to deal with them.”
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