Pjanic has started all 12 of the club's matches in Serie A this season and has been an integral part of their rise to the top of the table after posting 10 wins and two draws.
The Bosnia-Herzegovina midfielder has found the net on three occasions – including both in their 2-0 win over Napoli last month.
His form for Rudi Garcia's side has seen him linked with a move to Manchester United, while he was said to be close to joining Zenit in the close-season.
"I won't exclude the possibility of one day playing elsewhere, but I doubt this will happen soon," he said.
"It certainly won't be in January, which is what some people have said, and certainly not in the next year and a half either."
Pjanic's current deal in the Italian capital expires in June 2015, and the club are reportedly looking to tie him down for a longer period.
