The Latics, currently in the bottom three and battling against the drop, face Millwall at Wembley on April 13, but Alcaraz insists Saturday's trip to Norwich is the priority.
"We have Wembley to look forward to but for me the most important game is always the next one and that is Norwich City," he said.
"We will worry about the FA Cup when it comes around next month.
"For now we must concentrate on the league because there are some important games coming up.
"We have shown in the last few games that we can win games in this league and we must keep that up if we are to move away from the bottom of the table."
The Latics defender only returned to Roberto Martinez's side recently after a six-month spell on the sidelines with a groin injury.
He is now determined to make up for lost time and added: "My season only really started two weeks ago.
"Everything before that I have forgotten about because it was not so good.
"Fortunately there is still time for me to make a difference - and I hope that is the case."