The Barbadian-born fast bowler had ended up being a barbarian for Australia's top scorer at the Lord's when his fiery spell saw Smith unable to duck the 90mph deliveries and eventually being taken off the field.
Smith sat out training at the Leeds ground today, and was seen receiving consolatory pats and arms around the shoulder from teammates and coach Justin Langer.
Smith was hit by Jofra Archer during Australia's first innings in the drawn second Test at Lord's.
Langer acknowledged that the loss of Smith - who scored centuries in both innings in the first Test at Edgbaston before making 92 at Lord's - is a setback to Australia as they defend their 1-0 advantage in the series.
Meanwhile Britain's sports minister, Nigel Adams, has condemned England cricket fans who have been booing Smith, calling their behaviour "distasteful" and saying it is time for the jeering to stop.
"We know what our plans are to beat England", said Langer.
Smith and David Warner served 12-month bans for their roles in the scandal during the Test series in South Africa a year ago.
"It's not unlike England losing James Anderson".
"He's picking up every day and he's obviously keen to play but unfortunately he's not really quite right for this Test match".
"It is always a blow".
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"It's not unlike Anderson - he's arguably their best bowler and we're going to lose arguably our best batter for this Test match", added Langer.
"We've got to make sure all the other guys - our senior players and younger players - step up and fill what are nearly unfillable shoes, because he's the best player in the world".
'Marnus comes in to play a role in our team and it's up to everyone else, particularly our senior players, to just make sure we give that little bit more output and cover Steve as best we can'.
Tests were conducted before Smith was allowed to return to complete his innings.
"The victor of this Ashes is not going to necessarily come down to one player from either side".
However, he was unable to play on the fifth and final day on Sunday as he awoke feeling "groggy".
And there was soon confirmation that Smith will not feature in the third Test.
During Saturday's play Smith was wearing a helmet without the additional stem guard neck protection introduced following the death of his former Australia team-mate Phillip Hughes who was hit by a bouncer in a domestic Sheffield Shield match in Sydney in 2014.
And that's the truth, we are literally here to win the Test match and we have our plans on how we think we can beat England.