The Gunners boss is confident of securing a deal before the window closes, with the emphasis on a midfield addition following confirmation of Aarron Ramsey's injury lay-off
Goal exclusively reported on Thursday that the Gunners were considering a move for Miroslav Klose or Alvaro Morata as a deal for Julian Draxler looks less likely to materialise, while Wenger is also keen on a midfielder and has made an enquiry for Southampton's Morgan Schneiderlin.
And the Frenchman has now confirmed that Aaron Ramsey will be out of action for six weeks, as exclusively revealed by Goal on Tuesday, accelerating the need to sign cover before the window closes on Friday evening.
"Ramsey will be out for four to six weeks. I count six weeks," he told reporters. "We are still trying to bring one body in because of Ramsey's setback and Flamini's suspension.
"I'm confident we will bring someone in today. It's 80/20 per cent chance.
"80 per cent of the activities happen on the last day. I would scrap the winter transfer window with ease."
Arsenal slipped to second place in the Premier League table following Tuesday's 2-2 draw with Southampton although Wenger is adamant that the Gunners still have plenty left in the tank in the title race.
He added: "We are in a strong position in the league so I don't see a reason why we are in an anti-climax."