Celtic have been warned to be "careful what you wish for" regarding the potential sale of Nicolas Kuhn.
RB Leipzig are reportedly increasing their efforts to sign the winger following previous "advanced talks" for their ex-player.
Celtic could potentially make around £15 million from the sale of the player, who impressed in the early stages of last season but saw a dip in form later on.
Kuhn made significant contributions to the team, both in the domestic league and in the Champions League.
His standout performances, including goals against Leipzig, caught the attention of the German club.
Former Celtic player Simon Donnelly has questioned if the club should be in a hurry to sell Kuhn, pondering how they would replace the German international.
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"You can't argue about his season and his numbers," Mr Donnelly said.
"There was a period where he was attracting a lot of interest because he was doing so well in the Champions League, scoring goals, performing well, and then I thought his form dipped a little bit towards the end of the season.
"But when you look from a wide player, I think his goals and assists were very, very good."
Donnelly believes Kuhn was close to being Player of the Year at one point, competing with Daizen Maeda.
He added: "I don't know how I feel about it.
"Jota is going to be a little bit away through injury.
"I'm not sure.
"It's one of those ones, careful what you wish for.
"Can you get somebody to come in and have that many assists and goals, right from the off?
"We don't know."
The former Hoops attacker believes the club are looking for replacements in the background, particularly targeting wide players.
He also stated that a striker and possibly a centre-back are needed, with Kieran Tierney as the top signing so far if he returns fit and ready.
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