By counting the attacking players we have? Left - Sancho, James, Pogba and even Lingard. Right Sancho, Greenwood, James and even Mata. Strike Cavani, Greenwood who needs games to develop. And, we should be able to cope with that group of players until the end of year when Rashford will be back. Next season? Well, we will have a new striker.
Those are senior players. We still have a few youth players who can play in some cup games to let senior players rest.
Not double counting players leaves us with:
LW: Pogba, Lingard
RW: Sancho, James, Mata
ST: Cavani, Greenwood
Without Rashford, it doesn't look that good imo. I wouldn't count James as a senior player, Mata seems past it and Lingard has never been that reliable here. We have four good forwards without Rashford and Martial and one of them is a midfielder.
Edit: That said, I think we should get rid of Martial eventually. He's not good enough. I just don't think we have the depth right now.