Celtic are in line to pay another £1.5million for Albian Ajeti if he hits performance-related targets, Football Insider can reveal.
The Scottish giants signed the Austria international striker, 23, during the summer window for an initial fee of £4.5million.
A Celtic source has told Football Insider that the deal has been structured in a way that the club have to pay top-up costs through various add-ons.
These payments are worth a further £1.5m in total and takes the capture of the forward up to a potential £6m.
West Ham also negotiated a sell-on clause as part of the deal that took Ajeti to Parkhead.
Celtic signed the front man permanently after initially discussing a loan or a loan-to-buy transfer.
But terms were eventually agreed after the London club accepted a major loss on the £8.5m fee they paid Basel in the summer of 2019.
Ajeti did not start a single Premier League match in his debut campaign but he was prolific at former club Basel, scoring 43 times in 96 matches.
At Celtic, the forward raced out of the starting blocks and banged in five goals in his first six Scottish Premiership matches, all of which were won.
But his form has nosedived after the international break along with that of his team.
Ajeti has been heavily criticised after failing to make the most of starts against Aberdeen in yesterday’s 3-3 SPL draw and AC Milan in last Thursday’s 3-1 Europa League defeat.