Thanks for your question.
I'm afraid online statements are usually not sufficient for visa application purposes. The UKBA generally do not accept them. The usual process if using online statements is the print the statements yourself and then attend a local branch of the bank to ask that they verify them.
They will then stamp, sign and date each page of the statement. You can then use this for visa application purposes.
If he has time before he applies then you should do this. If he doesn't (ie. Before his current visa expires) then he should submit the statements with his application. The verified statements should then be sent thereafter with a covering letter explaining. If they reject on this basis then you have a reasonable chance of appeal because the statements would have actually existed at the time of the original application.
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