Sell Ibra, Villa (he is not good enough for Barcelona), Maxwell, Mascherano(never liked him also the lack of mentality he has prooves that he is a bad transfer), Cáceres (you can see he does a lot of mistakes that cause trouble for Sevilla), Victor Sánchez, Hleb... loan promising youngsters to premier league or serie a clubs.
Buy Wayne Rooney (if ferguson retires it would be easy to get him), the best forward for Barça to buy, a simple bitter taste. The best after Messi.
Sign Guardado on a free transfer (his contract with Deportivo should end in this summer) for a regular use of rotation.
In case of injuries loan Kevin-Prince Boateng. I watched all the matches he played this season, even though sometimes he gets sloppy, usually he is a perfect passmaker and makes hilarious through balls as a beast striker with good finishings...
For rotation buy Thiago Motta, he is much able than lots of midfielders to fit in barça's system... and also he is cheap.
Buy Philipp Lahm or Gareth Bale. Gareth bale is fantastic, i bet he can play like a left wing version of Dani Alves. But if the board would say that he is so expensive then buy Lahm. Lahm is good for barça standarts and can play on both wings.
Try to buy Fabregas again, to dominate every competition. But if you can't buy him; then buy Nuri Şahin, the Turkish version of Fabregas who plays in Borussia Dortmund as a team captain in a young age. His style is similar to Fabregas, and he has got better statistics than Fabregas this season. This boy made Dortmund league champions...
Per Mertesacker, Javier Pastore and Santi Cazorla are also good alternatives for their positions.
I bet some of these players are in the Mourinho's shortlist, it would be clever to act faster than him.
I noticed that my sentences are formed "buy that, sell that, do that" like i'm talking to someone face to face

. It's because of my poor english, forgive that...