The Frenchman was disciplined for arguing with the referee during last month's 3-1 defeat by Group H winners Sevilla. He was sent from the dug-out and then clashed with the fourth official over his failure to relocate to the stands.
"I'm worried about the ban being extended because for us the first leg of the next round is at home," he said. "The next round is the last 16 and I'd like to be on the sidelines for it.
"I don't think UEFA have enough to lengthen the ban, but I don't know. There is no hearing; we just sent a letter explaining what happened."