"Carlton has done a really good job while Andy has been out," Allardyce said.
"It's a tough decision based upon how Carlton performed last week and obviously I'll make that decision on Friday when we pick the team to play Everton.
"After he spent a long time in the wilderness over the summer, it took a little bit of time to get him back into top condition and now he's done that he's produced more goals than he did last season.
"Goals are what it's all about for us at the moment. In our last four games we've won them all by two goals."
West Ham are unbeaten in their past five fixtures and are currently on a run of four wins to find themselves sitting 10th on the table.
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