Assaidi moves to strengthen the Stoke squad following Peter Odemwingie's injury.
The Potters had been hoping to make Assaidi's loan deal from last season at the Britannia Stadium a permanent one, after they agreed a fee believed to be around £5 million for the Moroccan but personal terms meant a deal looked unlikely to happen.
But Stoke revived their interest late on last night, and Assaidi ended up signing for the club on a further loan spell.
Stoke chief executive Tony Scholes, told the club's website: “We thought we had concluded our incoming transfer business for this transfer window but we re-evaluated our plans after losing Peter to injury for the foreseeable future.”
Assaidi scored four goals for the Potters last season with some eye-catching displays, though they may have to wait a little bit for the Moroccan to make his second debut as he's been struggling with a cartilage injury at Liverpool.
Manager Mark Hughes said: “It’s unfortunate that we look like being without Peter for a while but following his setback we felt it was important that we moved to bolster the resources at our disposal.
“It’s clear from talking to Oussama that he really enjoyed his time with us last season and he’s looking forward to picking up where he left off with us.”
The Potters will be hoping for just as successful a loan spell this season as last term.