A disappointing afternoon at Ashton Gate for the Seasiders brought a 2-0 defeat and fresh injury worries.
Gary Taylor-Fletcher hobbled off at the break while Keith Southern was stretchered off just before the final whistle.
With Ollie away working on a potential signing, assistant boss Steve Thompson took charge of the side.
Trialist Jean Calve started at right back with fellow trialists Razak Omotoyossi, Malaury Martin and Sunny named on the bench.
Pool started off the brighter side, Charlie Adam's effort just skimming the post after just three minutes.
Ishmel Demontagnac saw a similar effort just go narrowly wide 15 minutes later as the Seasiders looked like they were in control.
But disaster struck when Bristol City midfielder Ivan Sproule found himself with too much space in the box to send the home side one up (21).
BRISTOL CITY 1-0 BLACKPOOL
And things got worse, three minutes later.
Moments after just firing wide, striker David Clarkson made the most of a mix up between Rachubka and Ian Evatt and doubled his side's lead (24).
BRISTOL CITY 2-0 BLACKPOOL
Pool were stunned as they had dominated possesion beforehand and now had quite a bit of work to do.
But the Seasiders just couldn't create the chances; an Evatt header which just went narrowly wide was the closest they came before the half-time whistle.
HALF TIME SCORE: BRISTOL CITY 2-0 BLACKPOOL
Gary Taylor-Fletcher, who had to leave the pitch at half time with the assistance of physio Phil Horner, was the only player to come off at half time, being replaced by Jason Euell.
A very quiet half created very few chances. In fact, we had to wait til Marlon Jackson's effort for City was saved by Rachubka in the 65th minute.
The half peetered out into a half of substitutions rather than a football spectacle.
Ishmel Demontagnac, who had a lively first half, and trialist Sunny both failed with long range attempts.
Sunny was a second half substitue, alongside Rob Edwards, Stephen Husband, Danny Coid and Razak Omotoyossi.
The day got even worse for Pool with less than five minutes to go when midfielder Keith Southern was stretchered off and replaced by Coid just before the final whistle on what was a very disappointing afternoon.
