[2] He made his international debut on 4 June 2009, officiating a match between France U-21 and Qatar U-20 at the 2009 Toulon Tournament.

One year later, on 1 October 2011 at the 2011 CAF Champions League, Grisha officiated the semi-final first leg match between Wydad Casablanca and Enyimba, which ended 1–0 for the Moroccan side.

Grisha was selected to officiate the 2014 Egypt Cup Final on 19 July 2014 between Zamalek and Smouha at 30 June Stadium in Cairo.

Grisha served as a referee at the 2018 FIFA World Cup and officiated a match between England and Panama.

One week later, Grisha took role of the video assistant referee at the 2020 Arab Club Champions Cup Final in Morocco (which was postponed for more than one year due to the COVID-19 pandemic) between Al Ittihad Jeddah of Saudi Arabia and Moroccan side Raja Casablanca.