Former Pakistan Prime Minister Imran Khan and his wife Bushra Khan were sentenced to seven years in prison and fined on Saturday by a court that ruled their 2018 marriage broke the law, his party said, Ednews reports.

It was the third ruling against Khan this week and comes ahead of national elections on Thursday that he is barred from contesting.

It was not immediately clear if his various sentences would run concurrently.

Khan is in prison in the garrison city of Rawalpindi, while his wife will serve her sentence at their hilltop mansion in nearby Islamabad. He already faces a 10-year disqualification from holding public office.

"After hours of rushed hearings at court, no cross examination of witnesses, and no due process - a mockery of the law," Khan's party, Pakistan Tehreek-e-Insaf (PTI), said in a statement.

"With the way these trials are being conducted, there will be a huge question mark on the February 8th elections. This is a test case for Pakistan's higher judiciary."

The couple were each fined 500,000 rupees ($1,800), ARY News reported.

Bushra was accused of not completing the waiting period mandated by Islam, called "Iddat", after divorcing her previous husband and marrying Khan.

The Khans signed their marriage contract, or "Nikkah", in January 2018 in a secret ceremony seven months before the former cricket superstar became prime minister for the first time.

There was controversy over whether they had wed before the period was complete. After initial denials of the marriage, PTI confirmed it weeks later.