By Renee Maltezou and Deepa Babington ATHENS (Reuters) - Greek Prime Minister Alexis Tsipras on Monday reshuffled his team handling talks with European and IMF lenders, a move widely seen as an effort to relegate embattled Finance Minister Yanis Varoufakis to a less active role in negotiations. An anti-austerity economist who has angered peers with his brash style, Varoufakis is facing calls to quit after returning from a meeting of euro zone finance ministers in Riga isolated and empty-handed while Athens scrambles to avoid bankruptcy. Tsipras and senior aides publicly voiced support for Varoufakis at a meeting on Sunday and agreed the finance minister would supervise a new team negotiating a reforms deal with lenders, a government official said. This would elevate him from his current position and give him a more active role in the negotiations, pushing Varoufakis to the sidelines.