Thrissur, Jan 8 (IANS): Congress leader Shashi Tharoor, who was asked by Delhi Police to join the probe into the mysterious death of his wife Sunanda Pushkar, is undergoing ayurvedic rejuvenation treatment at a centre in this Kerala district.

"Tharoor was busy finishing his book and he was undergoing a 14-day general wellness programme for ailments like frozen shoulder and stiffness," owner of Perumbayil Ayurveda Mana (ayurveda centre) Sajeev Kurup told IANS Thursday.

"He was here for a week in September and then he was told to undergo a 14-day in-house therapy. His present 14-day therapy started Dec 26," he said.

Kurup said the treatment of the Lok Sabha member from Thiruvananthapuram will be over by Friday and he should be out of the centre in the evening.

"Some people who undergo the 14-day rejuvenation treatment protocol ask for an additional day to remain in the centre and that's basically meant for getting back to normal routine. So far, Tharoor has not asked for an extension," he said.

Tharoor's wife Sunanda Pushkar, 52, died in mysterious circumstances in a Delhi hotel Jan 17 last year. Tharoor was then a minister in the government of then prime minister Manmohan Singh.

On Wednesday, Delhi Police Commissioner B.S. Bassi announced that a Special Investigation Team has been formed to probe afresh the case of Pushkar's death.

Police also sent a legal notice to Tharoor on the same day to join the probe.