PM me with what positions you looking for etc etc and will try and help, Leverkeusen is a great team, great squad, keep Rolfes and Bender what ever you do! Derdiyok is quality, if you can get Richard Sakutu Pasu early, get him as well as Marcell Jansen from HSV is a great LB.
Lukas Sinkiewicz turns out amazing after the 1st season, if you play him enough, get Holger Badstuber from Bayern if you can, great partnership!
Deniz Naki - St Pauli is a great investment too, as well as Nuri Sahin - Dortmund for years to come.
get Maruo Formica from Newells i think (Fm10 not playing at the moment) and maybe look at brining Podolski after the 1st season.
Edgar Prib is a good left hand sided mid, great potential, try see if you can make Toni Kroos' loan move permanent, or maybe loan another season!
you have Adler in goals who is awesome, a good backup to him would be Consigli - Atalanta or Ustari - Getafe.
sell Keibling and that other waste of a striker (cant remember his name) and look to get Mike Hanke (cheap great target man, Olexander Gladkyi - Shakthar, Eugene Selezynov - Dnipro in)
Daniel Schwaab is awesome too, keep him, maybe sell Castro and get a better backup Rb too , hope this helps