The bad thing was that he couldn't walked at all after this.
The foot just twisted when he started running.
If it's not the achilles, then it can be the metatarsal, but I think this is something serious, it cannot be a sprain with the replay and him not being able to walk.
If it's the achilles, it will be 6 months, so he will be back in October next season.
If this is a bone in his feet, it can be something like a month or 6 weeks, so I am pretty sure that his season is over now.
With Rashford out for a few weeks (if this is the groin, it's miminum 3 weeks to heal), Varane injured (we never know with him), Casemiro suspended every 5 games, the end of the season will be tough