Deals of the day -- mergers and acquisitions

July 11 (Reuters) - The following bids, mergers, acquisitions and disposals involving European, U.S., Canadian and Asian companies were reported by 2000 GMT on Wednesday:

** Spain's Telefonica said it is studying offers for its call centre business Atento, which it attempted to float last year, as part of a wider plan to cut debt.

Earlier, financial website El Confidencial said Telefonica would sell Atento in the next few days in a deal worth up to 850 million euros ($1.04 billion), about half what it was hoping to raise in the IPO last year.

** Teliasonera is looking to sell its Spanish mobile operator Yoigo, four people familiar with the matter said, in a 1 billion euro-plus deal that could attract telecom tycoon Carlos Slim, Vodafone Group Plc and France Telecom as bidders.

** South Africa's Mondi Group said it will buy German packaging firm Nordenia International from Oaktree Capital, in a $782 million deal that will give the paper maker a bigger presence in consumer packaging.

** Energy company Unit Corp said it will buy oil and natural gas assets worth $617.1 million from Noble Energy Inc in an all-cash deal to expand its presence in the Anadarko basin.

** Tech Data Corp will buy Brightstar Corp's 50 percent ownership interest in their joint venture, Brightstar Europe Ltd, a distributor of supply chain products for the mobility industry, for $165.6 million in cash.

** PSA Peugeot Citroen struck a tentative deal with Fiat to end their Sevelnord delivery-truck venture, part of broader restructuring moves to be outlined to the French automaker's unions on Thursday as it tackles mounting losses.

** U.S. car-sharing company Zipcar Inc said it bought privately owned Austrian Denzel Mobility CarSharing GmbH, which operates as CarSharing.at, to expand its presence in Europe.

(Compiled by Shubham Singhal and Juhi Arora in Bangalore)