Tottenham Hotspur-bound Son Heung-Min has been "badly advised," according to Bayer Leverkusen teammate Hakan Calhanoglu.
Widespread reports on Thursday said South Korea international Son, 23, was set for a medical at Spurs after the clubs agreed a €30 million deal.
Son missed Leverkusen's 3-0 Champions League playoff victory over Lazio on Wednesday and the Bundesliga club's sporting director, Rudi Voller, confirmed to kicker that the attacking midfielder had been in London.
Voller also told Sky Germany on Wednesday: "There is a request and there are talks, but nothing is done. Son would not have played today anyway -- he was sick at the weekend already. At this moment he is our player."
He added: "I saw many medicals in this business where there was no deal afterwards. We will try to reach an agreement, but only under our conditions."
Leverkusen midfielder Calhanoglu, who broke the deadlock against Lazio, told kicker that the news of Son's impending transfer had come as a surprise for the team.
When Son did not show up at the training ground on Wednesday morning, his teammates tried to contact him but he did not answer any messages.
"We were then informed what's going on," the 21-year-old Turkey international said. "It's a bit disappointing. I tried to reach him but I could not get hold of him.
"The whole team is disappointed, but it's not his fault -- he's a good lad. I believe that he's been badly advised."
Calhanoglu, who was accused of forcing through his transfer from Hamburg to Leverkusen last year by taking sick leave, suggested Son's father had influenced the decision to move to Spurs.
Calhanoglu said: "You certainly have huge respect for your dad when you are 23, but you have to make your own decisions at one point."
Hamburg are set to receive 10 percent of the Son transfer fee, which has apparently yet to be agreed despite previous reports, and €500,000 training compensation, according to local paper Hamburger Morgenpost.