Amalfitano earned himself a red card after clashing with former West Brom team-mate Chris Brunt - adding to the misery surrounding West Ham's humiliating defeat in the fifth round of the FA Cup.
And Amalfitano's manager admits the midfielder's antics are far from ideal considering West Ham's already thin squad at present.
"It's another miss for next week and another body less, which was unprofessional from his point of view," Allardyce told reporters after the West Brom defeat.
"We will probably have some players back, but we want them all back and fit because we haven't got the biggest of squads in terms of numbers."
Amalfitano, as Allardyce points out, now adds to a growing absentee list for the Hammers and there is real worry as to whether West Ham's season will simply peter out.
With no more cup competitions to aim for, how will the east London side fare in the closing stages of the season?
Will Allardyce's men go all out in their attempt to secure European football or will the injuries and suspensions take their toll - just as they did against West Brom on Saturday afternoon?
For the Baggies, however, it's a rather different story, with yet more to celebrate under new boss Tony Pulis...