The Chilean is expected to leave Arsenal by the weekend as his teammates are becoming increasingly disgruntled with how the saga is playing out.
Balague says mentions Chelsea as one of the teams, and also suggests another club are keeping an eye on the situation.
It has been reported that the United deal hinges on whether Henrikh Mkhitaryan will move the other way.
The Armenian has fallen out of favour with Jose Mourinho and wants to leave the club.
However, his wage demands and the commission for his controversial agent, Mino Raiola, are still being negotiated.