Mabasa helped the side finish off in the top eight of the 2018/2019 Absa Premiership season.
The player made 27 appearances for Celtic in league and cup matches this past season, scoring 10 goals and three assists.
Mabasa has been with the side from the start of his professional career in 2014, working his way up from the development structures of the team.
The former Grey College student, who is slowly making a name for himself in South African football, shares that his happy to stay at Celtic.
Mabasa admits that they have had a tough season and looks forward to the off-season rest. – Report by Tshenolo Meruti