In an Instagram post on Friday, Mr Tan called the 7-0 defeat “one of the worst nights in our history”.
“(Events) of last night led to emotions running high with some abuse on my social media from unfamiliar accounts,” read the post. “I regret responding and apologise deeply. I hold myself to a higher standard. I am human. I was hurting too.”
He said that he had always wanted to be more open through social media and to meet people privately as “there are many who have offered constructive feedback and perceptions from the ground.”
He added that FAS had advised him and its members that open engagement with its stakeholders was “best done in formal organised settings”.
“Tough questions will be asked over the next two weeks and we will do this openly,” he said.
In comments to CNA on Friday afternoon, Mr Tan said: “I appreciate the support that people have conveyed to me and the FAS.”
Additional reporting by Matthew Mohan.