COLLINGWOOD forward Jesse White is waiting on the results of scans after rolling his ankle at training on Monday.
Magpie football director Neil Balme said there was some "concern" with White's injury.
"Jesse White has been training fabulously, but unfortunately he rolled his ankle at training today," Balme told the club's website.
"He's having scans at some point during the day (Monday). We don't know the results as yet. It's a little bit of a concern, but once we know more we'll be able to tell you more."
The injury is a disappointment for White who had been in top shape on the training track. 
The 27-year-old dropped eight kilograms over the off-season in a bid to improve his match conditioning.
He shed 27 seconds from his 2km time trial personal best time, setting a benchmark to follow throughout the pre-season.
The Magpies are also confident their decision to send Ben Reid to Germany for treatment will reap benefits.
Reid – who has dealt with a multitude of soft-tissue injuries in the past 12 months – is being assessed by Bayern Munich club doctor Hans-Wilhelm Müller-Wohlfahrt, who initially treated the All Australian defender.
"Ben is on his way back (from Germany) now. All the reports are that we're expecting a pretty good outcome from this," Balme said.
"We always thought it was pretty minor injury in itself, it (the idea of sending Reid to Germany) is just around the other soft tissue injuries to see if there's any systemic problem.
"The reports so far show that he should be able to respond pretty well to this and he should be able to be flying when he gets back."
Balme said the Magpies were "very pleased" with how Dane Swan's recovery from off-season hip surgery was tracking.
The 2011 Brownlow medallist has been stuck in the rehab group at training, spending the bulk of his sessions running laps, and is yet to join his teammates in football-specific drills.
"Dane's training very well. He's had a fair bit of surgery post-season, so what we're doing is working him into a position of fitness where he can play," Balme said.
"He's not in the regular program with the footies, but he's working really hard. We're really pleased with where he is at the minute."
After knee reconstructions late last year, Brent Macaffer and Matt Scharenberg are also progressing ahead of schedule, although the club is loath to set a specific return date for the pair.
"We can't put a time on when they'll play, but we expect both of them to have some kind of impact in this year's season but we're just not sure when," Balme said.