Callum McGregor has agreed a multi-million new deal after Celtic promised in the summer they would reward him for staying put, Football Insider understands.

The Glasgow giants announced today that the midfielder, 26, had put pen to paper on a new five-year contract that ties him to the club until the summer of 2024.

A Celtic source has told Football Insider that McGregor has been rewarded with a significant pay rise for his development into one of the outstanding players in the Scottish game.

There was Premier League interest in the Hoops academy product in the summer, notably from Leicester and their manager Brendan Rodgers.

But Celtic made it clear that McGregor would not be sold at any price, in the same window that Kieran Tierney joined Arsenal for £25million.

The new deal will run one year beyond the versatile midfielder’s last agreement, which had been due to expire in the summer of 2023.

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It means he will be lifted into the top bracket of earners at Celtic, with his new agreement worth around £30,000-a-week.

The club’s best-paid player is believed to be Christopher Julien, who was signed from Toulouse in the summer for £7million.

McGregor has been one of Celtic’s star performers during their remarkable run of three consecutive trebles, which has included eight league titles in a row.

He made huge strides during Rodgers’ reign and has maintained his position as one of Celtic’s outstanding players during Neil Lennon’s spell back at the helm.

McGregor has already made a remarkable 24 appearances this season, scoring five goals and supplying two assists from midfield.

In other Celtic news, it can be REVEALED that the club have agreed the terms of a £5million-plus deal.