Celtic winger James Forrest revealed the prospect of the current squad developing played a part in his decision to sign a new contract.
The 21-year-old agreed an improved deal tying him to the Hoops until December 2016, while Adam Matthews and Charlie Mulgrew both penned new deals that secure their futures until the summer of the same year.
Celtic boss Neil Lennon is keen to reward as many of his title winning squad as he can with contract extensions as he looks to raise the clubs European profile in the coming seasons.
Forrest said: "I had another three years left on my contract but that's me here for another four years now so I'm delighted.
"I have been here since I was nine. I have always wanted to play for Celtic and I want to continue playing for Celtic.
"Most of the players have been here for the last two seasons now. We are gelling well and I think we are playing really well now.
"The squad is pretty young and the more games we play together, I think the better the team will get.
"You want to play in the Champions League and Celtic have been in that a lot for the last 10 years so I want to stay at Celtic."