Messiah (Jesus) is the minister of Mahdi
The prophet of Islam (PBUH) said: “When Mahdi (A.J) sees Jesus, he will say to him “Come and lead people in the prayer”. Jesus (PBUH) says: “This grand prayer has been arranged for you to be performed and he stands behind Mahdi (A.J) and pledges allegiance to him.
Muntakhab al –Asar, page 316
And we also read in the book of “Malahem” by Ibn Tawus that Jesus says:
“I am selected as a minister not as a leader.”
The text from : islampfr.com
