Felix, 19, sealed a move to Atletico for a club record transfer fee of €126 million despite interest from a number of European teams.
Atletico Madrid have signed Kieran Trippier from Tottenham for around €25 million.
The England international had been expected to leave North London this summer and was initially linked to a move to Serie A with Napoli and Juventus mooted as potential suitors.
However, after agreeing a deal with Tottenham, Trippier arrived in Madrid on Wednesday where he underwent a medical before putting pen-to-paper on a three-year deal.
Trippier, 28, started...
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Man Utd in right-back conundrum
It reports that the North Londoners want around £30 million...
England face the Netherlands in Guimaraes on June 6 in the semifinals of the competition and should they win they will face Switzerland or Portugal three days later in Porto.
The decision to leave out right-back Trippier comes a year after he was one England's leading players in their run to the semifinals of the...