I'm glad I don't have to make that decision, having said that for £8m a year I think I might. I was looking at this over the weekend, looking at Chelski and M.U. fixtures and I figured we would make top 4 if we win 5 out of our remaining 6 games.
Chelski have to play both Liverpool and M.U. away from home, the most I believe they will pick up is 10pts putting them on 76pts
M.U. Have to play Everton away and Citeh and Chelski at home, I can't see them picking up more than 13pts out of a possible 18pts. That puts them on 74pts
Le Arse play Watford, Wolves and Leicester away. I see one win and two draws as the best they can hope for, meaning the 14pts (assuming they all their other games) giving them a total 67pts we have 4 games at home and two away, lose to citeh and win all our remaining games 15pts gives us 69pts and 3rd spot.
So resting players against Citeh may not be a bad thing.