Essendon coach John Worsfold has expressed doubts regarding the validity of Conor McKenna's positive test for Covid-19, while compatriot Conor Glass has hit out at the criticism aimed at the Tyrone native, who remains self-isolating in Australia.

The former underage football star, who reached the All-Ireland minor final with the Red Hand County back in 2012, produced an irregular test last week, before testing postive on Saturday for the coronavirus.

However, McKenna then returned a negative test on Tuesday, which has raised doubts over the process from the Bombers coach.

Essendon's match with Melbourne was postponed on Sunday as a result of the McKenna test, and the player will undergo further tests this week.

"There's some doubt in my mind. I don't know if there's doubt in other people's minds but again we're waiting to find out exactly what it means," said Worsfold on Wednesday. 

"There's some pretty smart people out there who will assess what Conor's testing results are saying, but he's had a positive test with some negatives around that. 

"From my own personal point of view, if you said, 'Has he definitely got it?', I couldn't answer that. I would say that I couldn't say that he definitely has or he definitely hasn't." 

McKenna will remain unavailable for this week's clash with Carlton, which will go ahead, as Essendon look to continue their encouraging start to the season, winning their opening two games.

Derry native Conor Glass, who also plays in the Aussie Rules league with Victoria-based side Hawthorn has hit out at the negative comments that have been aimed at McKenna as a result of the positive Covid-19 test.

"Absolutely shocking behaviour on how this situation was handled," tweeted Glass.

"Surely some sort of confidentiality comes into play. Not one thought was given to how the player might feel from having the entire football media and fans getting on his back!"

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