Celtic were on the wrong end of some seriously poor and pivotal officiating decisions on Sunday.
The sending off of Yang and a contentious penalty awarded against Tomoki Iwata for an alleged handball has seen the club approach the SFA and release a statement.
Celtic has formally appealed Yang’s red card and will find out the verdict on Tuesday.

Brendan Rodgers finds himself under fire for his outspoken criticism of the officiating post-match, particularly his direct mention of John Beaton’s role in the VAR decisions. Rodgers’ comments, which labelled the officiating as ‘incompetent,’ could lead to disciplinary action from the SFA, potentially including a touchline ban.
However, Celtic is standing firmly behind Rodgers, prepared to support their manager should the SFA pursue any penalties against him for his remarks, CeltsAreHere understands.
Celtic released a statement on Monday expressing their “serious concerns regarding the use of VAR” during the match against Hearts.
CeltsAreHere further understands that the club have requested to hear the VAR audio from the match. If Celtic are given the audio, it will also come with the images/footage that referee Don Robertson saw.
Moreover, as CeltsAreHere has become aware of, Celtic had previously communicated with the SFA on five separate occasions before the match, raising questions about decision-making and seeking improvements behind the scenes.