Oblak is still relatively young for a keeper
At 27 years of age, the shot-stopper is only a couple of years older than Kepa, and if he were to move to Stamford Bridge, Chelsea could get at least a decade of his best performances.
Goalkeepers tend to perform consistently well into their late thirties and the Blues will be keeping this in mind when they look at his potential asking price. An investment for the long term.