Talking at media at the Parliament House here, Shah said that the time given to Khan under the defamation notice for an apology is expiring in the next couple of days.
“Imran has yet to tender an apology for leveling allegations he could not prove,” he added.
He said afterwards he would initiate legal proceedings against Khan.
Shah, who belongs to Pakistan Peoples Party, had served a notice to Khan in end-September after PTI chief leveled corruption against allegations against him.
Talking about electoral reforms, Shah said that his party has convened a meeting tomorrow to discuss election reforms.