Crystal Palace boss Dougie Freedman insists he must add to his squad if the Eagles are to compete in the Championship this season.
Palace endured an alarming 2-1 defeat to Blue Square South side Welling on Saturday and Freedman believes the loss told him a lot about his players.
"The result was disappointing but this has taught me a few lessons about what players can do and what they can't do," said the 38-year-old Scot.
"It showed me that some of the young players are nowhere near ready for the first team and that we need more depth in the squad.
"We need to add to our squad to make us competitive in the Championship.
"We are way short in squad numbers. We need to add a left winger, possibly a right winger, a couple up top and maybe a centre-half."
Palace gave opportunities to several trialists at Welling, including Preston forward Jamie Proctor, while Jose Baxter, who has been training with the club in recent weeks, also featured.