Bayer Leverkusen will not accept a cut-price offer for Arturo Vidal from any club outside of the Bundesliga amid reports of interest from Arsenal.
The Chile international, who is currently at the Copa America, has been linked with a move to Emirates Stadium this summer as a possible replacement for Cesc Fabregas.
It has also been reported that Vidal, 24, wants to follow former Leverkusen boss Jupp Heynckes to Bayern Munich.
But his club insist that their star player will not be sold to a Bundesliga rival, while any other club from around Europe would have to meet their asking price, which is rumoured to be in the region of £19million.
Leverkusen manager Robin Dutt told 11freunde.de: "We are showing our rivals understanding for trying to land our best players.
"Anyway (general manager) Rudi Voller, (executive) Wolfgang Holzhauser and I have an agreement. And that is that we will not sell Arturo Vidal to any club from the Bundesliga.
"In terms of a bid from a club outside Germany, there is an acceptance limit in terms of the financial aspect.
"Still we have yet to receive such a bid for this player."
Juventus, who are remodelling their squad following their underachievement of 2010/11, are also thought to be following Vidal.