Brisbane captain Tom Rockliff faces another stint on the AFL sidelines because of a hamstring injury.
Rockliff limped off during Brisbane's 77-point away loss to Port Adelaide on Sunday.
Coach Justin Leppitsch says the injury appears minor but he's concerned at Rockliff's ongoing nerve-related hamstring issues.
"It's minor but it has happened a few times now," Leppitsch said.
"And each time it has only been (sidelined) a week or two but it has been a month apart that it has happened a few times.
"Obviously there's some things going on there that we need to investigate."
Rockliff will have scans on Monday and is certain to miss Saturday night's home game against Collingwood.
Brisbane, with just one win in seven games, expect Daniel Merrett to play against the Magpies after being a late withdrawal due to illness from the loss to Port.