The other two known Elders will be played by Sylvester Stallone and Sharon Stone, but have not been named yet.
Schmoes Know claims that The Elders will be an integral part of Guardians of the Galaxy 2.
There are reportedly at least four Elders in Guardians 2, but only two that are definitively known: The Collector, played by Benicio del Toro in the first Guardians movie, and Ayesha, played by Elizabeth Debicki (The Night Manager).
A new report, however, indicates that they will play a significant role in Guardians of the Galaxy 2 and other movies leading up to the climactic battles of Avengers: Infinity War.