The sister of All Blacks star Ryan Crotty has raised concerns over his concussion problems after his latest head knock during last night’s Bledisloe Cup victory in Sydney.

Shea Crotty, a top New Zealand basketballer who has played for the Tall Ferns, expressed her concerns on twitter last night after the game in which Crotty was knocked out after colliding with teammate Jack Goodhue.

She wrote as a comment while retweeting a post stating she wants to see her brother grow old and able and not battling the brain forever.

Crotty has already suffered six concussions in the past 15 months with Coach Steve Hansen saying the midfielder would not play next week at Eden Park.