Gilmour made his competitive debut for Arsenal in their 3-0 win against Vorskla Poltava in Kiev in the Europa League Group E on Thursday evening.
The 19-year-old midfielder came on as a substitute in the 76th minute, as the Gunners won 3-0.
According to WhoScored, the talented and promising young midfielder had a pass accuracy of 80%, passed the ball well and in good areas, and had an overall good cameo appearance.
Barcelona defensive midfielder McGuane has taken to Twitter to congratulate Gilmour on making his competitive debut for Arsenal.
McGuane was on the books of Arsenal from 2005 until January 2018 when he joined Spanish and European giants Barcelona.
The youngster - who has a release clause of £22 million in his contract at Barcelona, according to The Telegraph - is part of the Barcelona B team at the moment.
The 19-year-old defensive midfielder is a hugely talented and promising young player who could break into the Barcelona first team in the coming years.
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