Sporting director Salihamidzic addressed the media as Bayern take part in a mid-season training camp in Doha, Qatar.
He revealed Bayern are working with Flick, installed as coach at least until the end of the season following Niko Kovac's sacking in November, on moves for the present transfer window."
Salihamidzic had previously said of January: "I don't think much will happen.""Hansi Flick has assessed the current situation and has come to the conclusion that we need to strengthen. Hansi and I are in constant contact.
"We are considering every option, but it is difficult to strengthen our squad during the winter break."
However, Germany international Sane, long linked with a switch from Manchester City, will not be among any new recruits.
Salihamidzic did not deny Bayern would renew their interest at the end of the season but, with Sane still sidelined following a serious knee injury, a January deal was ruled out.
"It is not an issue for the winter [window]," he said.
Bayern have this month already agreed to sign Alexander Nubel, who will leave Schalke on a free transfer at the end of the season, seemingly putting star goalkeeper Manuel Neuer under pressure.
But Salihamidzic has assured there is an understanding with Nubel, 23, that Neuer will remain first choice for the start of the next campaign.
"Alexander Nubel will be a huge asset for FC Bayern," he said. "He is ambitious and a top character.
"Alexander knows that Manuel Neuer is our number one. He is looking forward to working with Manu."