Manchester United's Tunisia international scored his first Premier League goal of the season as his side lost 3-1 at Brighton on Matchday 5.
The Tunisian midfielder, who came on as a second-half substitute, reduced the deficit with a powerful 25-yard strike in the 73rd minute.
Brighton had taken a three-goal lead through Danny Welbeck (20), Pascal Groz (53) and Joao Pedro (71).
Source: Agence Tunis Afrique Presse