The final round of presentations is expected to take place in November.
The shortlist comes after SingTel had added MPG to the review after it had first shortlisted MediaCom, Starcom and eight-year incumbent MEC in August.
Managed by R3, the review was first called in June as part of a periodic review of the telco’s key vendors and partners.
SingTel recently bagged the exclusive broadcast rights to the Barclays Premier League football competiton in Singapore.