Arsenal hero Ray Parlour says Arsene Wenger must buy a new centre-half and midfielder in January.
Parlour would like to see a bid for Southampton midfielder Morgan Schneiderlin revived.
He said: "Mats Hummels would be great, a world cup winner and a good player.
"For midfield, I would go for [Morgan] Schneiderlin if you can get him. He's at a good age. Lots of players are linked. [Sami] Khedira would have been great.
"Players that have played in big games won't be phased by anything. Schneiderlin hasn't, but I can see him improving."