Diego Simeone feels Jan Oblak's recent contract extension is vital to Atletico Madrid's future as he is "probably the best keeper in the world".
Slovenia international Oblak signed fresh terms on a four-year deal with Atletico last week, the new agreement reportedly including a release clause of around €100 million (£87m/$112m).
The former Benfica goalkeeper, 26, has spent the past five years in the Spanish capital having succeeded Thibaut Courtois as the club's number one in 2014.
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Simeone compared Oblak's new deal to Antoine Griezmann's contract extension last year in terms of its importance to the Rojiblancos moving forward.