Both players – along with Celtic’s Ryan Christie, another close Armstrong contact – missed all three matches for Scotland in the international break against Israel, Slovakia and the Czech Republic, but Tierney has now been tested at repeatedly negative for the virus.
The left-back also released a statement via Arsenal insisting he shouldn’t have been seen as close contact with Southampton midfielder Armstrong in the first place.
Armstrong’s 10-day isolation period will end on Friday, making him eligible for the Saints’ trip to Chelsea on Saturday.
Tierney, who was asked to self-isolate for 14 days, said: “I am so disappointed and frustrated to be in this situation.
“I followed all the regulations and made sure I was socially removed from my teammates at the hotel. I also tested negative.
“I know Arsenal and the SFA are currently in talks with the Scottish authorities to better understand. “
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The Mail Online reports that Lothian Health Board officials have been called to identify who could be considered close contact with Armstrong.
They are said to have discovered Tierney and Armstrong were seated nearly three meters apart while playing video games at the Scottish base, and thus adhering to the two-meter social distancing guidelines.
Arsenal remain hopeful of obtaining enough evidence to convince the Scottish government that Tierney should be allowed to take on City at the Etihad, although their hopes of winning a special dispensation appear distant as authorities continue to take a firm stand about the virus.
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