Feel like we're going to sign two players who can play center forward/striker. They don't have to be top class and really just have to be reliable availability, necessary technical ability, ability to score goals, and be an outlet/focal point up front to play off of.
With Martial running down his contract (and inability to really shift him off due to wages and injury record), he can stay for his final 12 months, fine.
Thuram, Benzema, etc. on a free and paying for a young player such as Hojlund or Ferguson who still needs to develop under coaches that we've seen improve individual players (Marcus, Sancho, AWB, etc.), would be smart.
Then next season, United would have more than 1 primary goal threat coming from the bench. Garnacho is a match winner and goal scorer. Sancho really isn't that final touch/goal scoring threat.