Donte Martin’s second consecutive hat-trick, alongside goals from Makai Bernard-Ferguson and Jacob Fasida, fired Palace into a commanding 5-0 half-time lead, extending their winning run to three matches in all competitions.
However, Reading hit back after the restart, scoring three times in the second half as Palace were reduced to nine men following red cards for Daniel Owoade and Alfie Mulvenna.
While pleased with the win, Alonso was keen to stress that his side must maintain their standards throughout a match, regardless of the scoreline.
“I think we played two different games, different halves,” he told Palace TV+. “We started very strong in the first half, we followed the game plan, the boys did very well, and we deserved to win.
“But I’m disappointed with the second half. It’s not because of the goals or because of the feeling that maybe we can draw – it’s more about the mentality. I think I saw complacency in the boys, and I think they can do more.”
Alonso also emphasised the importance of responding collectively when circumstances change, particularly after Palace’s two dismissals made for a nervy conclusion.
“We need to improve with the mentality and understand the context better,” he added.
“Obviously, we have two players sent off and we need to understand what we need to do when we are playing with nine players, because we need everyone together, fighting for the same objective.”