His potential absence is another headache for United boss Jose Mourinho, who is already without a host of first-team players. With the pair marking each other at a corner, Young elbowed Tadic in the stomach.
'Yes, he elbowed me and I asked him, "Why did you do this?". "I can fall down but it was really odd because I didn't expect that from him".
Rob is ESPN FC's Manchester United correspondent.
Southampton manager Mauricio Pellegrino said after the match: "I haven't seen the replay but it is hard for the referee to see in one second what happened in all different places - but I have to respect the decision".
The incident was not included in referee Craig Pawson's report and, after reviewing video evidence, the FA chose to charge Young.
'I'm disappointed about that because you don't expect that from him, because he's an experienced player and he can not do that I think'. He's expected to miss Premier League matches with Everton and Stoke City, as well as a 3rd round FA Cup match with Derby County.