Jol added: "When we gave away that goal we lost the game. That is disappointing but it's not typical for my team."
Indeed, Anthony Gardner was only recalled because skipper Ledley King was forced to miss the game with a groin injury and remains a doubt for Saturday.
Gardner, who only just returned from a thigh injury picked up in September, was paired alongside Michael Dawson, having fulfilled central defensive duty admirably at the beginning of the season.
King has struggled with injury twice already this season, but despite having Gardner, Noe Pamerot and Noureddine Naybet as back-up, the club were understood to have agreed personal terms last week with 20-year-old Dutch defender Ron Vlaar. However, Feyenoord last night agreed to buy the player from Dutch league leaders AZ Alkmaar for £2.5m.
Yesterday, Vlaar told his new club's website it had always been his preference to stay in Holland.