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From RFC Website:
Grimes foot setback
By richmondfc.com.au
4:30pm AEST Tuesday, May 21, 2013
Richmond defender Dylan Grimes will be out of action for the next 6-8 weeks, as he recovers from a foot injury.
Grimes, who was sidelined following the Round 6 game against Geelong, was initially scheduled to return after a couple of weeks.
“Unfortunately, Dylan’s foot has not responded as quickly as we had hoped it would, so we will now take a very conservative approach with him,” said Richmond’s General Manager of Football, Dan Richardson
http://www.richmondfc.com.au/news/2013-05-21/grimes-foot-setback