The right-back picked up a yellow card against Montenegro, meaning he is suspended for Tuesday’s crucial final qualifier against Poland.
A win will seal a place at next year’s World Cup finals in Brazil and Walker says he will be fully behind his England colleagues as they attempt to get the desired result.
“It's a disappointment for me, a stupid yellow card, hopefully the boys will go and get the result on Tuesday and I'll be cheering them on.
“Fingers crossed and touch wood [my next game will be a friendly] but we still have a job to do on Tuesday. We’ve still got to get a result and put in a performance.”
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