Capello has persistently ignored Kirkland, who has just one cap for his country.
Martinez feels that Kirkland's club performances are being strangely overlooked. The Spaniard said: "Maybe the fact he is not being considered for England comes from the England camp because I cannot understand it. If you look at the standard of his performances - week in, week out - it is up there with the best in England.
"What Chris needs to do is carry on performing the way he did today until the end of the season and I still believe that maybe one day he will get that call again.
"Maybe the England camp have a different view and different targets at the moment but, if he keeps performing the way he has been doing and remains injury-free, I feel behind the scenes - without any mention of it in the media - he has got as good a chance as anybody."