This is in the AFL injury list.
Darcy has sustained a "moderate grade" hamstring strain, with the Dockers not yet putting a timeframe on his return. Fremantle's bye is well timed, but the ruckman would still be expected to miss round 13 before pushing to play against Greater Western Sydney on June 17 at the soonest. – Nathan Schmook
https://www.afl.com.au/matches/injury-list
There was also this yesterday https://www.afl.com.au/news/940563/freo-s-big-blow-ruckman-to-miss-weeks-with-hamstring-injury
Darcy has sustained a "moderate grade" hamstring strain, with the Dockers not yet putting a timeframe on his return. Fremantle's bye is well timed, but the ruckman would still be expected to miss round 13 before pushing to play against Greater Western Sydney on June 17 at the soonest. – Nathan Schmook
https://www.afl.com.au/matches/injury-list
There was also this yesterday https://www.afl.com.au/news/940563/freo-s-big-blow-ruckman-to-miss-weeks-with-hamstring-injury
I’m hopeful it is less than 4 weeks, I really need him!