Martinez was delighted with Mirallas' performance in victory over Chelsea.
"Kevin Mirallas is now in a stage of his career where he can play in many positions and understand a different way of playing," Martinez told evertontv.
"He played in that position at his previous club Olympiakos, so we are all very aware of that option.
"At that time [against Chelsea] we were defending really well and were comfortable, but it is important to have pace and mobility up front. Kevin always gave us that outlet and that real threat going forward.
"We need to be able to adjust and adapt and Kevin as an individual showed what he can do."
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