Telefonica (TEF.MC) is interested in buying Polish mobile firm Polkomtel, but such a deal could be tough to sell to investors concerned about its sluggish home market and after a run of big acquisitions last year. Sources familiar with the situation said Telefonica, the euro zone's biggest telecommunications firm has joined a crowded field of potential investors studying the possibility of a bid but it has not decided whether to take part. [ID:nLDE7171GJ] Telefonica declined to comment.
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