Borussia Dortmund coach Thomas Tuchel and sporting director Michael Zorc have both refused to confirm reports that Ilkay Gundogan is set to move to Manchester City this summer.
At the weekend, Bild and The Sun both reported that Gundogan, 25, is on his way to City and will sign a five-year deal with the Premier League club.
The Germany international, who is under contract until 2017, did not comment on the speculation following his return to the starting lineup in Dortmund's 3-0 win over Hamburg on Sunday.
Kicker also reported on Monday that Gundogan is set for the Premier League, and that Dortmund are expecting an official bid in the region of €30 million in the next few days. Ruhr Nachrichten has claimed that the move only hinges on the transfer fee.
"I can't confirm the transfer," Tuchel told Sky Deutschland. "And shouldn't it be the other way round? We have to announce it."
Zorc told reporters that Dortmund "are not interested in giving any water-level reports" -- a reference to the 1995 floods in the river Rhine, when radio reports would regularly announce potentially disastrous rises in the water level before declaring soon afterwards that they had fallen again. He added: "We principally don't comment on it."
Meanwhile, Dortmund are still hoping to convince the trio of Marcel Schmelzer, Henrikh Mkhitaryan and Mats Hummels to stay at the club.
All are under contract until 2017, and although it is reported to be likely that Schmelzer will sign a new deal, Mkhitaryan and Hummels have yet to commit their future to Borussia.
To convince them of a stay, Dortmund could increase their wage budget from €90m to €120m, kicker claims.
The paper added that the club is also interested in bringing Bayern Munich's Mario Gotze back to the club, with the 23-year-old having also been linked with Liverpool.
Dortmund are also said to be looking at Everton striker Romelu Lukaku again, with Ruhr Nachrichten reporting that their interest "is bigger than ever before."