Two weeks is a long time in football.
'With Jack, the simple answer is Mason Greenwood,' England boss Gareth Southgate said on August 25 when asked about Aston Villa captain Grealish and his omission from Nations League squad.
Since then, Grealish has been pulled in from the cold. Mason Greenwood and Phil Foden have been banished after sneaking girls into their hotel room in Iceland.
Jack Grealish is in line to make his senior England debut against Denmark on Tuesday night
Mason Greenwood and Phil Foden were photographed in the hotel room by the girls who stopped by to visit them in Iceland and it cost them their place in the squad for Denmark
'I think Mason Greenwood's performances, his goalscoring ability and maturity was impossible to leave out,' Southgate had added when pressed on his selection last month.
Based on the escapades of the young Manchester United striker in Reykjavik, it may no longer be quite so simple for Southgate.
And that works in Grealish's favour. Southgate's comments at the end of August pointed more towards the sheer number of roadblocks facing the Villa skipper. Some viewed it as Southgate laying down the challenge to Grealish, others saw it as a clear indicator how far down the priority list the 24-year-old really was.
Few can relate to the scrutiny on Greenwood and Foden right now better than Grealish.
In 2015 he was pictured inhaling 'hippy crack' and months later was pictured lying on his back with a packet of cigarettes on a road in Tenerife. Just this year he was charged with driving offences having breached lockdown rules to go to the house of then Villa team-mate Ross McCormack.
His mistakes were magnified and while team-mates argued his maturity to the contrary, question marks over his conduct off the pitch tainted what many witnessed on it.
But as England prepare to take on Denmark in Copenhagen tonight, there is no Greenwood, no Foden, and Grealish, despite all his misdemeanours in the past, has an opportunity to stake his claim on the international stage.
Gareth Southgate left Grealish out of the initial squad as he pointed to those ahead of him
Grealish has experience in the Under-21 side but is yet to get an opportunity with the seniors
Nitrous Oxide, has been nicknamed 'laughing gas' due to the euphoric and relaxed feeling people who inhale it can sometimes feel.
The gas is normally bought in pressured canisters, commonly transferred to a container, e.g. a balloon.
Nitrous oxide is not illegal to possess, but this doesn't mean that it is safe to use. The effects of nitrous oxide vary depending on how much has been inhaled but they include:
• Feelings of euphoria, relaxation and calmness.
• Dizziness, difficulty in thinking straight and fits of giggles/laughter.
• Sound distortions or even hallucinations.
• In some people, a headache can be an unwanted immediate effect.
• Unconsciousness or death from lack of oxygen
Not just for upcoming matches but the focus now for all in this squad is the rearranged Euro 2020 next summer. It seems inevitable Grealish will be handed his debut in Denmark, the key now is, can he use it as a springboard for success?
At 24, Grealish is being tasked with leading his boyhood team and the scrutiny that brings has worked against him.
In 2015, in his breakthrough season with Villa, Grealish was pictured inhaling balloons containing nitrous oxide, commonly known as laughing gas, at a party.
The story, splashed on the back page of the Sun under the headline 'High Jack', was a bad look.
He apologised to his manager Tim Sherwood and at 19, there were question marks whether he could be trusted. Foden and Greenwood could do worse than seeing how Grealish turned it around.
Two months later, Grealish was back in the headlines - again for non-footballing reasons - as he