Imran Khan on Wednesday promised to cooperate with Nawaz Sharif to tackle key challenges like terrorism despite "serious political differences" with the Pakistan Muslim League - Nawaz chief, who is set to become Pakistan's next prime minister.

"We have serious political differences but we decided that we will work together to solve the country's problems, including terrorism," the cricketer-turned-politician said in a video message aired at a news conference by his Pakistan Tehrik-e-Insaf party.

The video was filmed in the hospital where Khan is recuperating after fracturing his spine in a fall at a campaign meeting days before the May 11 election.

Sharif visited Khan in hospital on Tuesday night and pledged to work with him to tackle the major challenges facing Pakistan.

"I say on behalf of all the people that we all want to move forward now. Nawaz Sharif came to see me," Khan said in the video.

Khan mounted virulent attacks on Nawaz Sharif and his brother Shahbaz Sharif while campaigning for the polls.

Shortly after it became clear on Sunday that the PML-N was set to win the polls, Sharif said, without naming Khan, that he forgave everyone who had abused him during the campaign.

Khan also outlined his plans to form the government in the militancy-hit northwestern province of Khyber-Pakhtunkhwa, where the Pakistan Tehrik-e-Insaf has emerged as the single largest party.

The provincial government will serve as a role model for the rest of Pakistan, he claimed.

"We have got a chance for the first time to form the government in Khyber-Pakhtunkhwa. We had been waiting for a long time to make the model of a new Pakistan, to make a province a model," he said.