Celtic manager Tony Mowbray wants a reunion with West Brom defender Marek Cech, according to the player's agent.
Mowbray left the Baggies earlier in the summer to take over at Parkhead and he has already signed Marc-Antoine Fortune, who played on loan at the Hawthorns last season.
Cech's representative, Juraj Venglos, now claims his client is the next West Brom player that Celtic have set their sights on.
Eredivisie runners-up FC Twente, managed by Steve McClaren, are also said to want the 26-year-old but it is not thought that West Brom boss Roberto Di Matteo will be willing to sell.
Venglos told SITA: "I can confirm that Twente would very much like to capture Marek.
"Apart from the Dutch club, Celtic are also maintaining their strong interest.
"But the problem is that West Brom do not want to release him. Di Matteo counts on him as a member of his squad for the upcoming season."
Venglos expects a decision on Cech's future before Sunday, adding: "I believe that everything will be sorted properly within this week.
"It is also possible that Marek will spend another season at West Brom."