Bulgarian international Aleksandar Tonev is set to let Celtic know within 24 hours if he will sign for the club.
Tonev's club, Lech Poznan, are reported to be close to agreeing a £2million deal with Celtic for the winger.
The final decision is set to be left to the 23-year-old, and he has made it clear he would be prepared to move to Scotland in order to play Champions League football.
Tonev's agent, Terence Chongwa, said in the Daily Record: "There is definite interest in Scotland.
"We can confirm scouts of Celtic have been to our games this season.
"We are holding a meeting tomorrow and Aleksandar's position could become clearer then."