Alex Oxlade-Chamberlain wasted no time in reminding his England team-mate and Manchester United no-show Luke Shaw about last night's football match.
The Arsenal winger played a key role in his side's 2-1 victory over the Red Devils in the FA Cup quarter-final showdown, setting up Nacho Monreal for the opener. Comparably, Shaw was substituted at half-time for reasons unknown.
Louis van Gaal may have deemed it a necessary change to alter his tactics or he may have been injured. Either way, the left-back did not play well. It is another blow for the £30 million summer signing. Not only is he failing to justify the fee, but his £120,000-a-week wages have put him under more pressure.
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There was no sympathy to be found in Oxlade-Chamberlain's corner, who tweeted Shaw a simple "#sorrynotsorry" message and an accompanying picture of him walking out of Old Trafford with a big smile on his face.
It was not an unprovoked attack, however, as he had responded to Shaw's original tweet, which suggested he was confident of getting on over his international team-mates.
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He said: "Prepared for tomorrows game!! @CalumChambers95 @JackWilshere @Alex_OxChambo see you tomorrow lads! Game on! 😬 #sorrynotsorry"
Shaw may be able to shake off Oxlade-Chamberlain's tweet as banter, he should be gravely disappointed with his contributions last night. Once again the 19-year-old was anonymous and is clearly struggling with Van Gaal's tactics.
Meanwhile his former team-mate, Nathaniel Clyne, has vastly improved at Southampton. In fact, the right-back has been so good that he has been linked with a move to Old Trafford.
The Manchester United full-back has been unfortunate with injuries this season and has plenty of time to develop into a world-class player as expected, but last night summed up what has been a terrible debut campaign.
Oxlade-Chamberlain, 21, has a few years on Shaw, but has come on leaps and bounds this season. His performances for Arsenal have seen him lifted above Theo Walcott in Arsene Wenger's plans and may have inspired the decision to loan out Joel Campbell and Lukas Podolski.
He too has struggled with injuries in the early parts of his career, but now looks like he has laid the foundations to become a great player. Every England fan will be hoping Shaw can follow suit.
Is Luke Shaw at risk of failing to deliver on his massive potential? Give us your views in the comments box below!
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