Atletico claims left-back Ajax defender Nicholas Tallafiko, reports El Confidencial.
As part of the "mattress" 26-year-old Argentine can be a replacement for Philip Luis, who is expected to leave the Madrid club this summer.
Earlier it was reported that Arsenal offered nine million euros for Tallafiko, but, according to the source, Atletico is ready to more than double this offer..
Talyafiko moved to Ajax in January 2018 from Independiente for 4.5 million euros.
This season, Talyafiko played 19 matches for Ajax in all tournaments in which he scored two goals and gave four assists.