CELTIC could be in line for a cash windfall this summer after Everton were linked with a move for Kristoffer Ajer.

The Norwegian centre-half completed a move from Parkhead to Brentford last summer for a fee of around £13.5million after five years in Glasgow's east end.

As part of the deal to take the 24-year-old down south, Celtic chiefs included a sell-on clause that would see the Premiership champions land a chunk of any future fee.

And it appears as though the Glasgow club could receive the cash during the summer transfer window after Everton registered an interest in Ajer.

The Athletic report that Goodison Park boss Frank Lampard is an admirer of the Norway internationalist and is keen on bringing the centre-back to Merseyside to bulk up his team's defence.

However, it is believed that Brentford will hold out for a large fee after Ajer impressed as the London-based club secured a 13th-placed finish in their debut campaign in the Premier League.