Austria international Emanuel Pogatetz, 30, has made only a handful of appearances for the Hammers, mainly as a substitute, since joining from German side Wolfsburg during January's transfer window on a loan deal until the end of the season.
Allardyce said: "I'll sit down and decide what to do after the game on Sunday, as I will about others like Gary O'Neil and our other loan players.
"We've already said to Emanuel Pogatetz 'thanks very much'. He's been a fantastic lad and a great professional but we're not going to make it permanent for next season.
"We'll deal with the other players after Sunday and first just concentrate on sending the supporters home happy after another home performance that brings the right result."