Our focus is on Goodison Park where Everton take on West Brom as the two clubs battle it out to become best of the rest.
Koeman told BBC Sport: "It was an outstanding team performance".
"I still believe in when we win the next two games at home that still something is possible above us in the table", said Koeman.
Looking the most likely opposition player to cause the Blues any problems, Nacir Chadli finally tested Joel Robles with a shot that the Spaniard beat away but without key players like Salomon Rondon and James Morrisson until late on, Tony Pulis's men were surprisingly toothless, even from set-pieces.
Koeman's new signings have been impressive, whilst some of the old cohort have enjoyed a renaissance in form and players like Romelu Lukaku have continued to play out of their skin. And if there's no pressure on the ball make sure we're not trying to play a high line because we'd be playing into his hands.
"They lost on Sunday at Tottenham so both of us, having had a good run, need to start again".
Ben Foster failed to hold on to Ross Barkley's 20-yard effort and Mirallas was there to pounce, smashing home from close range.
"Of course, you can't compare the two teams - but we played well today, controlled the game and we were unsafe in certain moments of the game". In a free role, he can be creative for Romelu.
One of the defenders tasked with stopping the Belgian global is 37-year-old Albion centre-back Gareth McAuley, who is enjoying a fantastic season of his own after being nominated for the PFA Player of the Month award for February. Now outside of the UEFA Champions League spots in seventh place, the Toffees know that European qualification is an absolute necessity as they work their way into an elite club.
Oumar Niasse proved Hull City's hero as he netted a superb double in the 2-1 victory over fellow strugglers Swansea City that gave a serious shot in the arm to the Tigers in their fight against relegation.