Ullathorne, a near ever-present in the side this season, picked up his fifth booking of the campaign on Friday, one that will automatically earn him a one-match ban, to be served with immediate effect.
His absence could open the door for some of the club’s fringe players, with Chrissy Palmer or, perhaps, the more likely choice of Dan Martin likely to slot into the vacant left-back slot, with the apprentice looking to cement a place in the side with his mentor now sidelined.
After picking up bookings against Lincoln, Bristol Rovers, Shrewsbury, Grimsby and, of course, Boston, the veteran left-back (pictured) will miss out on the trip to Spotland, where the Magpies will look to break their barren patch in front of goal, having netted just once in their last five matches.
"It is disappointing to lose Rob, especially having already had a few of the other boys missing so far with suspension," said Thordarson, speaking to Notts County Online.
"But again, we have to deal with it. It opens the door for someone to step in at left back now and keep that place and make Rob fight for his place."
Elsewhere, the Icelandic Magpies gaffer will take a strong side to Aston Villa’s Bodymoor Heath training ground for a behind-closed doors game with the Villa reserves.
The Premiership outfit are likely to field the likes of Kevin Phillips, Aaron Hughes, Grant McCann and Lee Hendrie, all looking to regain match fitness. Although, Gudjon will have a chance to test his side’s reaction to Friday night’s 2-1 defeat, one that has seen the Magpies’ winless streak stretch to a massive seven games.
Most of those who featured on Friday are expected to play some part at Villa today, with an 11 o’clock kick-off having been scheduled.