Tom Mohan's side take on Norway in their Group B opener, with temperatures expected to be in the mid-thirties.
Kick-off is at 3:45pm Irish time this afternoon.
Lee who plays with Manchester United is returning to the U19 squad having featured for Stephen Kenny's Under-21s,
He is one of the most capped Ireland underage internationals of all time as the versatile player is closing in on his 55th cap.
Kick-off is at 3:45pm Irish time this afternoon.
The first game in Group B - which also contains France and Czech Republic - will see Tom Mohan's squad come up against Norway in a battle for three crucial points.
The top two teams from Group A & Group B will advance to the semi-finals, so Ireland know exactly what is at stake in this European Championship opener.
Republic of Ireland Head Coach Tom Mohan
"As a group of staff and players, we work extremely hard and we want to bring our preparation onto the pitch on Monday to produce a big performance. The players have showed an excellent attitude since we met up last Tuesday and in the three-day training camp in Dublin before that, where their performances evaluated them to being included for this tournament.
"A lot of work went on behind the scenes, with FAI Head of Fitness Dan Horan helping our doctor Andrew Delany and physio Michael Spillane to keep the players in shape and in the right frame of mind considering this is officially the off-season period at club level for them. They did a lot especially in preparation for the extreme heat that we have experienced here in Yerevan. Everyone on our staff has been brilliant in playing their part and the players have responded to everything that has been asked of them.
"We have momentum built up from the qualifiers. The new boys who have come in have blended in really well with the squad and we want to keep that momentum going. It's a great occasion, but we have to play the game and focus on what we have to do.
"It's a fantastic opportunity for the players. There is great competition for places as the players have trained very well and their attitude has been top class. We don't want to leave this tournament with any regrets and we are aiming to get off to a positive start."
REPUBLIC OF IRELAND SQUAD
Goalkeepers: Brian Maher (St Patrick's Athletic), George McMahon (Burnley)
Defenders: Andy Lyons (Bohemians), Mark McGuinness (Arsenal), Oisin McEntee (Newcastle United), Andrew Omobamidele (Norwich City), Jack James (Unattached), Kameron Ledwidge (Southampton), Ciaran Brennan (Sheffield Wednesday)
Midfielders: Joe Hodge (Manchester City), Lee O'Connor (Manchester United), Barry Coffey (Celtic), Niall Morahan (Sligo Rovers), Brandon Kavanagh (Shamrock Rovers), Conor Grant (Sheffield Wednesday)
Forwards: Jonathan Afolabi (Unattached), Ali Reghba (Leicester City), Tyreik Wright (Aston Villa), Matt Everitt (Brighton & Hove Albion), Festy Ebosele (Derby County)
KEY STATS
- Ireland have qualified for this tournament twice since it was regraded to Under-19 level - finishing fourth in 2002 under Brian Kerr, and reaching the semi-finals in 2011 with Paul Doolin
- Before it was regraded to Under-19 level, Ireland won the tournament in 1998 when it was called the UEFA European Youth Championship
- Ireland were the only team to qualify having won their six games across the Qualifying Round and Elite Round
- In the last two years, where a number of the current players have been involved, Ireland have won nine, drew twice, and lost just once (to eventual European champions Portugal)
- Norway have been involved in this tournament four times (bowing out in the Group Stages in 2002, 2003, 2005, 2018)
- Winners of their Elite Round, Norway overcame Ukraine, Albania, Germany and Hungary (scoring eight goals and conceding five across six games in total)
- Norway Head Coach Gunnar Halle played 64 times for his country and also lined out for Oldham Athletic, Leeds United, Bradford City, and Wolverhampton Wanderers
HOW IRELAND QUALIFIED
Qualifying Round
10 October, 2018: Republic of Ireland 3-1 Bosnia & Herzegovina
13 October, 2018: Republic of Ireland 3-0 Faroe Islands
16 October, 2018: Republic of Ireland 2-1 Netherlands
Elite Round
20 March, 2019: Republic of Ireland 5-0 Romania
23 March, 2019: Republic of Ireland 3-1 Azerbaijan
26 March, 2019: Republic of Ireland 2-0 Russia
FIXTURES
Monday, 15 July: Republic of Ireland v Norway, Yerevan Football Academy Stadium, KO 15:45 (Irish Time)
Thursday, 18 July: Republic of Ireland v France, Banats Stadium, Yerevan, KO 18:00 (Irish Time)
Sunday, 21 July: Republic of Ireland v Czech Republic, Yerevan Football Academy Stadium, KO 18:00 (Irish Time)
