A footy game between Carlton and West Coast Eagles could prove vital in determining if Harley Hicks murdered a baby during a home burglary, a court has heard.

Mr Hicks' twin brother, Ashley, claims he was at home with their father watching the football game before going to his bedroom where he stayed all night phoning and texting his girlfriend at the time 10-month-old baby Zayden Veal-Whitting was being attacked.

Defence barrister David Hallowes has asked a Supreme Court jury sitting in Bendigo to look closely at Ashley Hicks' alibi.

Harley Hicks, 21, has pleaded not guilty to murdering Zayden in a house at Eaglehawk Road, Long Gully, in the early hours of June 15, 2012.

Zayden's mother, Casey Veal, found him lying in blood-stained sheets shortly after realising her home had been robbed.