The reason we got Arna, Alexis, Augusto and etc is to have decent rotation. Those injuries would happen eventualy, if not now so later this season. Last season, around April, Inzaghi started to rotate the attacking pair in each game and Imo, if he really trust Arna and Alexis, he should let them play more. Now he have no choice, but I hope its a blessing in disguise so Arna will gain confidence. I really think he's a good player, he just need to play more.
Bottom line, its a must win and our line up is still strong even without Dimarco and Toro.