After spending the 2018/19 season on loan at Rayo Vallecano, where he impressed, De Tomas is in Lisbon to undergo his medical examinations with the Portuguese side.
Benfica are expected to pay between 20 and 25 million euros for the player, which comes as good news to Madrid as they look to increase their sales' figures this summer.
An option for Ruben Dias has also been discussed between the two clubs.
Meanwhile, Theo Hernandez's expected 20 million euro switch to AC Milan has not yet been confirmed, although he underwent his medical examinations with the Rossoneri on Monday.
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