The Hammers’ poor run of form continued on Saturday, as they went down 3-1 at home to their London neighbours in the Premier League.
Glenn Murray put Palace in the lead at the Boleyn Ground in the 41st minute, and Scott Dann doubled the advantage six minutes into the second half.
Murray made it 3-0 to the Eagles on 63 minutes, but he was soon sent off after charging into Winston Reid for a second bookable offence.
West Ham pulled one back through Enner Valencia in the 76th minute, but it proved to be a mere consolation.
Poyet was not part of the Hammers’ matchday squad on Saturday, but he was still disappointed with the loss.
However, the 19-year-old hopes that Sam Allardyce’s side can bounce back with victory over Premier League leaders Chelsea at home on Wednesday.
Bad day today for the team, tough game on Wednesday but hopefully can turn it around and get a result. #whufc— Diego Poyet (@diegopoyet7) February 28, 2015
West Ham are currently ninth in the Premier League table with 39 points from 27 matches, nine points behind fourth-placed Arsenal, who play later today.