Celtic have announced the biggest shirt sponsorship deal in Scottish football history.

Worldwide betting company Dafabet has been named as the club's new main sponsor, taking over from Magners as part of a new four-year agreement.

The Dafabet name will be featured on the front of the club's shirts from the beginning of season 2016/17. The total value of the deal is undisclosed.

Celtic chief executive Peter Lawwell said: "We are delighted to make this announcement, which is fantastic news for the club and our supporters and ensures a positive, long-term and high-value partnership for the future.

"We have already enjoyed an excellent relationship with Dafabet and we are delighted they have made such an increased commitment to the club.

"Celtic continues to be one of the world's great football clubs and one which is delighted to attract such high-calibre associations.

"Partnerships such as the one we announce today allow us to look forward with confidence as we ensure Celtic maintains its position as the biggest and best in Scottish football.

"We welcome Dafabet to Celtic as a main club sponsor and very much look forward to working with such a successful organisation over the next four years."

John Cruces, head of sports marketing and sponsorship at Dafabet, said: "A year ago I said that no matter where in the world you are you see Celtic shirts, such is their tremendous support and fan following.

"We're talking about one of the most iconic and recognised shirts in football.

"Now to have Dafabet at the heart of Celtic sponsorship is a milestone event and a very proud moment for us.

"Having already formed a strong partnership with the club we can only go from strength to strength over the next four years."

Dimitris Karatzas, managing director of online betting and gaming at Dafabet, said: "We continually aim to increase our presence in football and believe we have achieved that aim year on year.

"To now feature on the front of one of the most famous shirts in football is another huge step forward for us.

"We are all very much looking forward to the next four seasons in partnership with Celtic FC."