Already on the precautionary list, first five Craig Clare has not trained yet either and is likely to this weekend, at least.
While Caskey is reasonably happy with the makeup of his overall squad, containing no loan players from the Mitre 10 Cup unions - although players of that calibre joined the club scene late in the season - he may yet be in the market for a midfielder due to having young players in that position other than the injury-prone Crowley.
"You wouldn't want to be solely reliant on his fitness at the moment."
Therefore, Waverley Harvesting Border's Fijian flyer Kaveni Dabenaise will get a good chance to prove himself tomorrow.
The top tryscorer in premier club rugby with 20 touchdowns, Caskey knows the lightning quick Dabenaise has the pace for Heartland, but there are still questions around his defence and ability to utilise that speed at the right moment - to be a creator of attacking opportunities, rather than just a finisher.
"It's a marked step up from club rugby to Heartland. It's yet to be seen, so we'll be watching him with interest."
The other new face which will be getting a lot of attention is the recently arrived flyhalf Steve Crosbie from Ireland, a long time team-mate of big lock Gavin Thornbury.
Coming from the Old Belvedere club, both Crosbie, 23, and Thornbury, 22, have been members of Leinster Rugby Academy and played Irish age grade rugby including the Under-20 World Cup - having known each other since they were schoolboys.
From a Dublin rugby family, Crosbie's second cousin David Corkery earned 27 caps for Ireland, while his brother Jody is also an Old Belvedere player.
Caskey said the young man could be tried at both first and second five-eighth.
"He'll probably play centre too, if needed. We've got to see him play, to be fair.
"Dane [Whale] played well last week, but it doesn't help that he didn't play club rugby [at No10].
"There's a few things to tidy up."
If chosen for Heartland, Crosbie will be included as an overseas loan player, the same classification given to Fijian Under-20 international Poasa Waqanibau in 2015.
Saracens fronted with some huge forwards when Wanganui played the development team last year at Cooks Gardens - the home side winning 15-6 despite barely winning a scrum.
However, the 2015 edition of the squad had a light cavalry feel with mobility emphasised over brawn, whereas the 2016 model is more tank-like and has already proved in the win over Taranaki Development and solid challenge to Waikato that there is real strength in the set-piece.
Saracens lost to Taranaki Development 19-3 last Saturday in Hawera, in even worse winter conditions than when Wanganui played there a fortnight ago.
The Hawke's Bay team led 3-0 at halftime before they took their turn to face the wind.
After two mud-larks in a row, Caskey was looking forward to the team playing on Cooks Gardens where, if the weather co-operates, they will be able to still run over the surface, rather than through it.
The game kicks off at 2.30pm.
The curtain-raiser sees the Wanganui Toyota Development team playing Hawke's Bay Under-19s at 1pm.
