Chelsea must clarify Maurizio Sarri's future at the club after he was defied by Kepa Arrizabalaga in the Carabao Cup final defeat to Manchester City, according to Michael Ballack.
Having gone down for a second time with apparent cramp, Kepa refused to go off in extra time of Sunday's encounter at Wembley, much to Sarri's frustration, with Willy Caballero ready to come on.
The game finished 0-0 after 120 minutes but City eventually won on penalties – Chelsea's goalkeeper failing to keep out Sergio Aguero's tame spot-kick before making a fine save to deny Leroy Sane, with Raheem Sterling hammering home the winning effort.