The club are inserting sell clauses into outgoing transfer deals as standard and that could lead to a windfall this summer with former Hoops stars Moussa Dembele and Jeremie Frimpong reportedly attracting interest with their performances for Lyon and Bayer Leverkusen respectively.
Dembele has nine goals in 19 Ligue 1 games this season, including five in his last seven, and that form has caught Manchester United’s eye, according to The Mail, with a potential £25m bid on the cards .
The 25-year-old joined Celtic from Fulham in 2016 and scored 52 goals for the Glasgow club before earning his £19.7million move to France two years later. His contract with Lyon expires in 2023, so the club could look to sell the striker this summer rather than risk losing him for nothing next year.
Frimpong, meanwhile, moved from Celtic to Leverkusen for £11.5million in the January transfer window last year and his performances in the Bundesliga have won many admirers with Bayern Munich, Borussia Dortmund and Barcelona, all credited with interest.
Celtic had to pay their former club Manchester City a 30 per cent portion of the recouped transfer fee for the right-back, and they are said to have negotiated a hefty selling fee themselves as part of the deal that brought the young Dutchman in Germany.
Leverkusen are believed to value Frimpong around the £30m mark, meaning that if he and Dembele complete reported moves this summer, Celtic could be in line to receive part of the £55m fee of transfer.