He had earlier announced his resignation in protest against the "injustice" meted out to the people of Punjab following the November 10 Supreme Court verdict on the Sutlej-Yamuna Link (SYL) canal water sharing agreement which, he and most other state leaders have been opposing.
The SYL agreement has become a major political issue in the poll-bound state in which Singh, a former Chief Minister, is leading his party's campaign to capture the power from the SAD-BJP alliance, which has been ruling for a decade.
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He had said that he decided to quit the Lok Sabha "as a mark of protest against the deprivation of the people of my state of the much-needed Sutlej river water."
Singh was elected to Parliament defeating BJP heavyweight and now Finance Minister Arun Jaitley from the prestigious Amritsar Lok Sabha seat.