The right-back became the first player to be retrospectively charged with violent conduct by the Football Association following his stamp on Adnan Januzaj towards the end of the 3-1 defeat to Manchester United.
"If he did do it deliberately it is fair enough to get three games. The referee didn't see it. I didn't see it, but they decided to give him that punishment and people around me said it was probably something deliberate.
"He said it was not deliberate but he apologised to the club, to the fans and to us. It is not what you need, but we move on."
Jol revealed he will be speaking to Riether again about the incident and added: "They are all responsible for their own actions. Sascha Riether is responsible and we are responsible. You don't want that sort of thing.
"He has been punished for it and I don't think he will do it again in the future.
"If he tells me he didn't do it deliberately and other people say he did there is always a grey area with that. But I think you should try not to stamp on someone's feet, probably fall over and do something."
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