The club said Rosa had been playing with the injury for several weeks.
It’s another blow for the Eagles and coach John Worsfold, who is already missing former Carlton forward Josh Kennedy, sidelined for a fortnight with a torn posterior cruciate ligament.
The Eagles are also without defender Beau Waters, who misses after his appeal against a two-match suspension for making head-high contact on Collingwood's Shane O'Bree failed at the AFL Tribunal on Tuesday night.
It’s not an ideal week for the Eagles to be undermanned. Lying 13th on the ladder they face the inform Swans, who smashed Richmond by 82-points at the SCG last Sunday.
Adding hype to the encounter is the memory of Barry Hall’s hit on Brent Staker during the sides’ last meeting, for which he was suspended for seven matches.
However, in better news for the Eagles, Worsfold has declared Mark LeCras, Ashley Hansen and Sam Butler as all fit and available for Saturday.
