Probably around 35. According to that BBC link, the numbers are the highest they've recorded, so I'm expecting a drop next season. The question is how significant could that drop be. To still get 40 injuries would be a highly interesting number and anything more than that would be remarkable (not in a good way). I think the question to ask is where will the injuries come from? Hojlund will get a few, I expect Martinez to pick them up, then we have the likes of Mount, Malacia, Shaw, etc. It really depends on who is still here and if we manage to ship out any players, particularly those who are prone to injuries. (e.g. moving Martial on is significant in this regard as he spent a considerable amount of time off the pitch rather than on it).
I'm going with 35, on the assumption that we'll see a downward trend next year. The more and more I look at my number and the more I look at the numbers from last season, I think 35 is a very optimistic number. I still expect us to have one of the higher totals in the league next season. Not sure if anything drastic is going on behind the scenes that will help us to reduce these injuries. If pre-season is anything to go by, I'm leaning more towards the 'no' column.