It comes off the back of the club’s disappointing 12-point loss to the Adelaide Crows last week.
Giants General Manager Football Jason McCartney confirmed the shock selection call on Friday morning.
“Stephen is the first to admit that his form hasn’t been where he’d like it to be,” McCartney said in a statement.
“We see this as a speed bump in the road. He’s a quality man and he’ll bounce back.
“It’s a sign of a strong football club that if people don’t perform at all levels, you need to have hard conversations.
“He’s an A-grade footballer, he’s an A-grade person and we’ll support him and he’ll bounce back.
“Our focus now goes onto Saturday night and Melbourne and how we can beat them.”
Giants coach Leon Cameron expressed his frustration over his midfield’s performance post-match.
“I pat my back seven on the back for the majority of the game, other than two or three disappointing easy goals,” Cameron told reporters on Tuesday night.
“But they’re defending 46 inside 50s, and we only had 26 or 27 up the end.
“It’s just not good enough. Our midfield, again, let us down.”
Stephen Coniglio won't line up against Melbourne tomorrow night.
— GWS GIANTS (@GWSGIANTS) September 10, 2020
Coniglio finished with 20 disposals, four marks and four tackles against the Crows, with only two of his teammates finding more of the ball. But it was not enough to save him from the selection axe.
It marks the second time this year Coniglio’s spot in the team has come under threat, with the 26-year old responding with a 27-disposal performance against Brisbane in Round 7.
Coniglio admitted in a press conference in July that aspects of the season had been challenging.
“It does get a little bit challenging at times,” he said.
“We‘ve just got to make the club a place where guys feel safe coming in and really enjoy hanging around and spending time in … where guys actually look forward to coming in the morning when they wake up.“
The midfielder is 15 games into a heavily back-ended $7 million dollar deal he signed during the off-season.
Coniglio took over the captaincy this season and has averaged 20.9 disposals, four tackles and 4.4 clearances but his kicking efficiency is the lowest of his career.
The Giants face Melbourne at the Gabba on Saturday night at 7.40pm in a crucial clash for both club’s finals prospects.