Celtic's traveling supporters launched their latest protest against the club's board prior to today's match at Aberdeen.

A large element of the champions' fanbase is unhappy with the way the January transfer window unfolded, with just two players brought in amid Brendan Rodgers' call for greater quality in his first-team squad.

Nicolas Kuhn and Adam Idah were the only two arrivals, with the latter a loan move from Norwich until the end of the season.

And with the focus now back to on-field matters with the window closed, supporters in the away at Pittodire have made their feelings clear amid the ongoing title fight with arch-rivals Rangers.

A banner was held aloft by a section of the fans as the teams emerged from the tunnel. 

It reads: "Celtic board - on your heads be it."

Audible chants of 'sack the board' and '[Peter] Lawwell, get to f***' could also be heard.

Rangers take on Livingston at Ibrox later today. They will play their game in hand over Celtic against Aberdeen on Tuesday night, where the gap between the teams could potentially be reduced.

READ MORE: Idah no Celtic panic buy as Rodgers makes Dembele comparison

Idah was not a last-resort panic signing, according to Rodgers, as he claimed the new Celtic forward has the same sort of potential that Moussa Dembele had when he first arrived at the club.

Idah joined Celtic on loan from Norwich City late on Thursday night, with the announcement of his arrival coming just before the end of the transfer window.

Idah himself said he first heard of Celtic’s interest on Monday, but Rodgers insists that the player was not forced upon him by the club after they failed to deliver his preferred targets.

“No, that wasn’t the case,” Rodgers said. “I’d players that were presented. That’s what it is. You have a number of options and then you pick the option.

“If the option isn’t right when you use the knowledge of the squad you have, then you don’t take it. You just add a name and then it all looks great if they are not going to fit the squad."