honestly, giroud is way over powered on the game IMO so if you play a lone striker formation you shouldnt need another ace yet, maybe a young gun.
CB - Papadopoulos from Schalke, Varane maybe from Real (he is a beast but never had the budget to buy him so dont know his cost.) Steven Caulker from Tottenham for some english blood maybe.
LB - for about 20m Alaba turns into the best LB in the game imo, and is class from the start, Santon from newcastle is another who turns out as well. for a solid and not too expensive enrique from liverpool for about 7.5m, wont find better for the price imo.
RB - Corchia from Sochaux is another young gun who is great going forward and develops a lot. Walker is not a bad choice either.
DM - Depends on what type you want, Romulo from Spartak Moscow for about 15-18m will do wonders in the middle, also Sandro from tottenham is a beast. Tachtsidis from Roma isnt world class yet but will be. If you want to keep with the French blood at arsenal M'vila or Capoue will do great as well.
For a more playmaking DM try Poli from sampdoria, he's a little pirlo for under 10m,