The Blaugrana announced in July that Messi had agreed a four-year extension to his deal which would have been "signed in the coming weeks, when Messi returns to the team for pre-season training".
Messi has still not actually put pen-to-paper as speculation continued he was contemplating leaving Spain.
Iniesta has denied claims of president Josep Maria Bartomeu's claims of talks over a new contract already being underway.
"We will take the photo with Messi's signature, hopefully before the end of the year", he told Fora de Joc.
The Dortmund hitman, who has has fired in six goals in his first five appearances this season, seems ready to gun down Spurs, captioning a picture of himself "let's go".
But Bartomeu has said he will do everything possible to keep the 33-year-old in Catalonia.
'Iniesta isn't just a reference point for us, but also for the young supporters, he has earned the right to play here until he decides not to any more, Andres is critical to this club and the intention is that this extension will be an indefinite contract so that he can finish whenever he desires'.
Juve slumped to a 3-0 defeat in their opening Champions League match against Barca where Iniesta shone in the centre of the pitch, turning back the years to deliver a vintage performance.
"The agreement with Iniesta will be special, it will be different just because it is him".
The biggest transfer story of the summer - even one that included Neymar's departure for a mind-boggling €222 million - was, rather, is one that has not yet happened. but one that's hanging over Barcelona like a proverbial sword.