Celtic have agreed a club record fee with Paris St-Germain for striker Odsonne Edouard and talks are "progressing" on a permanent deal.
The 20-year-old spent last season on loan at Celtic from PSG, scoring 11 goals.
BBC Scotland understand the French side were hoping to receive a transfer fee in excess of £8m.
Celtic's record outlay is the £6m paid for both Chris Sutton and John Hartson in 2000 and 2001, respectively.
Speaking in March after Edouard scored the decisive goal in a 3-2 victory over Rangers at Ibrox, Celtic boss Brendan Rodgers said: "He is one of the best young players I have worked with - his movement, his touch, his all-round play."
Edouard scored two more derby goals in a 5-0 win at Celtic Park in late April.
However, his season was curtailed by a hamstring injury which forced him to miss the club's Scottish Cup final success.
PSG need to sell 60m euros (£52.9m) worth of players by the end of June, to comply with financial fair play (FFP) rules.
Uefa introduced 'break-even' rules in 2013, requiring clubs to balance their spending with their revenue.