Alex, who joined the young Bees in the summer of 2020, has been a regular member for Neil MacFarlane's young Bees so far this season, and will join up with the Irish youngsters ahead of a training camp and a fixture against Wales Under-21s next Friday.
Alex has played 17 times for Brentford B this season and most recently featured in the 2-1 win over Chelsea Under-23s on Wednesday.
The 19-year-old has been involved in the youth setup with Ireland before at Under-19 level and will be aiming for minutes in next week's fixture.
Alex will come up against three of his Brentford B teammates in Nathan Shepperd, Joe Adams and Fin Stevens up in Wrexham as they have been called into the Welsh youth squad.
If you want to watch the match next week, which kicks off at 1:00pm, the FAW are streaming live on their YouTube and Facebook pages.