Swiss international Hakan Yakin expects to hold signing talks with Celtic.
Happiness, not money is the key for Hakan Yakin
But the Glasgow club appear to have been snubbed by Yildiray Basturk.
Bayer Leverkusen have confirmed that they accepted an offer from Celtic for the Turkey international.
But Basturk, who helped Turkey knock Brazil out of the Confederations Cup, has reportedly rejected the opportunity of a move to Scotland.
That blow appears to have encouraged Celtic boss Martin O'Neill to further pursue long-standing target Yakin.
The midfielder was outstanding as Basle defeated Celtic in last season's Champions League qualifier.
I can confirm that we have accepted an offer from Celtic
Leverkusen's Reiner Calmund
Yakin's agent, Ertan Irizik, told the Daily Express: "When the Celtic manager returns from his holiday then we will speak with him.
"I can't say when the talks will take place. This has not been settled.
"But it is important that both myself and Hakan are present for the discussions and we are ready to come to Glasgow.
"This isn't a financial deal, it's about what will make Hakan happiest.
"Hakan knows this is a big move and wants to make sure that he gets a good feeling from the coach who is looking to sign him and that is why he wants to meet people directly."
O'Neill is expected back from holiday in the next couple of days and that is expected to spark some long-awaited transfer activity at Celtic Park.
Yildiray Basturk has been impressive for his country
His priority is a midfield playmaker and Celtic have also been linked with Giorgi Kinkladze, who has left Derby County, and Nolberto Solano, for whom Newcastle United are open to offers.
Leverkusen were willing to part with Basturk, despite him receiving rave reviews for recent performances for Turkey.
The German club's managing director, Reiner Calmund, said: "I can confirm that we have accepted an offer from Celtic and now the decision is in the hands of
However, the 24-year-old does not appear to be willing to leave the Bundesliga for the Scottish Premier League, even with the promise of at least some Champions League football.