Rangers and Celtic have announced the renewal of their shirt sponsorship deal with Carling in a five-year deal worth a total of £18m.
"This is the biggest (such) deal in Scottish football history," said Celtic chief executive Peter Lawwell, adding that it would provide great security.
His Rangers counterpart Martin Bain was equally effusive about the agreement.
"(It) speaks volumes about the scale and unrivalled passion and commitment of our supporters," he added.