The defender, who has four Argentina caps to his name, has been with the Portuguese champion since 2013 and the deal includes an option to make the switch permanent at the conclusion of the campaign.

During his time with the Eagles, the 28 year-old won three league crowns, as well as lifting the Taca de Liga twice and the Taca de Portugal once.

With Serie A coming towards the end of its mid-season break, Lopez – who will wear the number two shirt – could make his Inter debut at home to Roma on Monday (AEDT).

Luciano Spalletti's side went five league games without a win prior to the rest period, a run which saw it drop from the table's summit to third, nine points behind leader Napoli.