The message to the Everton hierarchy needed no interpretation.In the Vitality Stadium concourses before kick-off on Saturday, during the 1-1 draw with Bournemouth and at full time, the Merseyside club’s supporters made their feelings known about the potential sale of teenage midfielder Harrison Armstrong to Nottingham Forest.“Don’t sell Armstrong, Harrison Armstrong, I just don’t think you understand,” they sang throughout the day, to the tune of Achy Breaky Heart. “If you sell Armstrong, Harrison Armstrong, you’re gonna have a riot on your hands.”An afternoon of emotion and symbolism ended with Armstrong standing for an extended period, clapping the away end as they repeated their message.He received sympathetic hugs as he left the pitch, from captain James Tarkowski and fellow defender Jarrad Branthwaite. Everton manager David Moyes had also been over to applaud the travelling support as his young charge’s name rang around the stadium.If any of the club’s hierarchy was in any doubt as to how fans would react to the news of a potential move for Armstrong, first reported by The Athletic on Saturday morning and confirmed after the match by Moyes, they know now. Consider them warned.“I know that there’s been an offer, but I’ve not got much else to say about it,” Moyes said, before adding that it would be a “club decision” as to whether they cash in on the 19-year-old academy graduate.The Scot then echoed his message from recent press conferences: that Everton needed to add to their squad, not weaken it by selling first-team players. Forward Iliman Ndiaye has also been attracting interest from elsewhere in the Premier League, including Manchester City, ahead of the summer window closing on Tuesday.It is hard to see how Everton could lose two players of this ilk at such short notice and replace them sufficiently to be equipped for a tilt at European qualification this season. That, after all, is the stated aim of their owners at The Friedkin Group, according to chief executive Angus Kinnear.