Khan told the BBC in an interview published online April 10 that Bibi was still in Pakistan because there was "a little bit of a complication," which he declined to explain.
"But I can assure you she is safe, and she will be leaving in weeks," Khan said during the interview, conducted in London.
The Catholic mother of five had been on death row for blasphemy since 2010 and was held in solitary confinement for eight years, reported ucanews.com.
In a landmark judgment in November, the Supreme Court of Pakistan quashed her death sentence and ordered her immediate release from prison.
The ruling sparked violent nationwide protests that came to an end only after the government agreed to stop Bibi from leaving Pakistan until a challenge to her acquittal was heard by the top court. On Jan. 29, the court upheld Bibi's acquittal, allowing her to exit Pakistan.
Days after the court's ruling, she was airlifted from a prison in Multan to the capital, Islamabad, where she reportedly was kept in a safe house due to death threats. Subsequent media reports stated preparations were being made for Bibi to be relocated with her family, who was living in an undisclosed location in Canada.
Catholic activists in Pakistan were dismayed that Bibi had not been flown out of Pakistan. Katherine Sapna, director of Christian True Spirit, said there was "total confusion" about Bibi's real situation.
"We assume that she is in a protective place," said Sapna, who is leading a delegation of politicians and activists to the Dutch parliament later this month to discuss the misuse of the blasphemy law and the forced conversions of females.
"But the confusion benefits Bibi and her family. The hardline clerics were the biggest challenge for the state during proceedings of her case," she said.
Kashif Aslam, a program coordinator for the Pakistan Catholic bishops' National Commission for Justice and Peace, said Bibi's presence in Pakistan appears as if the authorities are waiting for a conducive time to move her.
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