By Tom Gott Virgil van Dijk has admitted Liverpool’s 1-0 defeat to Nottingham Forest came as a “reality check”. The Reds had enjoyed a perfect start to life under new manager Arne Slot but came crashing down to Earth after the international break as Callum Hudson-Odoi inflicted the first defeat of the Dutchman’s new era. A thoroughly unimpressed Van Dijk warned his teammates that such a lacklustre performance cannot be replicated going forwards. “First of all, it was a very disappointing day,” Van Dijk reflected. “The result, and also most of the performance was too rushed and we lost too many…