The Turkish side topped Group G ahead of Porto and RB Leipzig and will go into the draw as group winners, meaning it could face Bayern, which finished second in Group B behind Paris Saint-Germain.
Besiktas is yet to taste defeat in the competition this season and speaking after Thursday's 2-1 win over Leipzig, Tosun said he would like to draw the German champion.
"We need to keep playing with the same discipline going forward," he told reporters.
"It doesn't really matter who we get in the next round because the 16 that remain are the best of the best.
"A game against Bayern would be special, though."
The defeat means Leipzig drop into the Europa League after they finished third.
The German side went behind on Thursday after Willi Orban conceded a penalty, from which Alvaro Negredo scored, and although Naby Keita equalised late on, Talisca scored a stoppage time winner for the visitor.
Orban also hit the post in an eventful game, but he says his side will now look forward to continuing its European adventure in the Europa League.
"I had the chance to make up for my mistake, but could only hit the post," he said.
"We created more chances than we normally do today, but we needed more composure.
"If we get the equaliser earlier I think we win this game. We had no expectations coming into the group stages, but we're looking forward to the UEL"