Petr Cech has warned Chelsea that today's opponents Southampton are the most dangerous they have been all season following the arrival of new manager Mauricio Pochettino.
Chelsea thumped Southampton 5-1 at St Mary's Stadium in the FA Cup in January, but less than two weeks later they blew a two-goal lead as the Saints claimed a point at Stamford Bridge.
That proved to be Nigel Adkins' last day in the charge of Southampton and Cech has been impressed by the improvements Pochettino has made since his arrival.
And the Chelsea 'keeper insisted the Blues cannot head to the south coast expecting another rout.
He explained: "They changed manager with Pochettino and they are more attacking, more organised with very good pressing which makes them more aggressive – and, in turn, more confident."
John Terry is available to manager Rafael Benitez – but his selection will be made with one eye on Monday's FA Cup quarter-final replay against Manchester United.
Chelsea's interim manager reported a clean bill of health following the international break.