"SP National General Secretary Ram Gopal Yadav has written a letter to Khan informing him about Mulayam Yadav's decision to revoke his suspension," party sources said here.
"I am extremely happy to inform you that SP national president Mulayam Singh Yadav has revoked your expulsion from the party," Ram Gopal said in the letter.
"You are requested to continue to serve the party like before," he said. Azam Khan, formerly a general secretary of the party, was considered a close aide of the SP leader since his early days in politics.
Azam Khan, who was a prominent Muslim face of the party was expelled after he vented his grievances against the leadership for Amar Singh's rising importance and the party's growing proximity with former Hindutva icon Kalyan Singh.