"Pakistan Rangers have confirmed that the trooper is in their custody. We have sought a flag meeting to get the trooper back," a Border Security Force (BSF) source said.
Satyasheel Yadav was part of a water patrol party in Akhnoor area of the international border in Jammu and Kashmir.
He was swept away in the river after their motor boat developed a mechanical fault Wednesday, BSF sources told IANS here.
"While three of his colleagues swam to safety, Yadav was carried to the Pakistani side by the powerful currents of the river," the source added.
The incident took the trooper to Bajwaat village in Sialkot area in Pakistan.
Yadav hails from Ferozabad in Uttar Pradesh.