The Rugby Football Union has dismissed the appeal by Newcastle Falcons against the four-match ban handed to James Hudson earlier this month.
Hudson, 29, was punished after the panel adjudged he tackled a player off the ground during the Falcons' 46-29 Premiership defeat by London Irish.
Falcons had launched an appeal following the receipt of video evidence from the Exiles.
Hudson is cleared to return to action from Tuesday, 1 November.
Sunday's 25-5 defeat at Saracens marked the first of Hudson's absences from Falcons duty, with the Premiership champions exploiting the gap left by the lock's unavailability.
"Top rugby is all about that, these guys are going to punish you if you're not spot on and that's where James is a big miss," Tait added.
"There's no doubt about it, we maybe give him too much responsibility, we need to get guys sitting around him more.
"He is the old line-out swot, and he runs it, he brings in new movement and him and Paul [Moriarty - Falcons assistant coach] work together so the ban doesn't help.
"We haven't done enough work with Glen [Townson] and Tim [Swinson] on covering that, because Saracens pressured it.
"We've got two weeks now to get things ironed out, before we go back into the campaign."
Falcons are currently bottom of the Premiership table, with one win and five defeats from their first six matches.