If Viljami Sinisalo didn’t get just how big Celtic were before he joined the club this week then he certainly will now. The Finland internationaljoined from Aston Villa in a deal worth around £1m and immediately flew out with the team for the 2024 USA Summer Tour. The youngster is still getting to grips with life at such a huge club but it is clear that he has been doing his homework by asking his footballing friends what it’s really like at a club like Celtic. John McGinn’s secret Celtic adviceSinisalo’s first point of contact was former Aston Villa teammate and huge Celtic supporter, John Mc…