The representatives from Blues are Kieron Assirratti, Robert Lewis, Liam Belcher, Seb Davies, Calum Haggett, Carl Lewis and Jarrod Evans.
"We have had five quality training sessions with this group of players and we feel we've prepared well for Scotland on Friday," said Connor.
"We have increased the intensity of our training sessions since our defeat to England just over two weeks ago and hope that will show in our games. There are some 16 year olds in the squad but there are also some 'old heads' who have been with us for a year who have the experience of playing in this tournament last season and also the wins over Australian Schools in December and last month's games against France and England."
Depending on the result of Friday's match, Wales will play either England or Portugal on Tuesday.
Wales Under 18 squad for FIRA-AER Under 18 European Championships:
Kieron Assirratti (Blues/ Coleg y Cymoedd/ Wattstown), Robert Lewis (Blues/ St Peters / Coleg y Cymoedd), Harrison Walsh (Ospreys / Bishopgore / Mumbles), Liam Belcher (Blues/ Coleg y Cymoedd / Pontypridd), Dafydd Hughes (Scarlets / Llandovery College / Llandovery), Sam Matthews (Ospreys/ Pencoed College), Matthew Dodd (Ospreys / Olchfa / Dunvant), Seb Davies (Blues / Coleg y Cymoedd / Pentyrch), Calum Haggett (Blues / Coleg y Cymoedd / Gilfach Goch), Tom Phillips (Scarlets / Coleg Sir Gar / Llangennech), Harrison Keddie (Dragons / Coleg Gwent / Caerleon), Lloyd Phillips (Scarlets/ Coleg Sir Gar/ Felinfoel), Shaun Evans (Scarlets/ Coleg Sir Gar/ Felinfoel), Ben Davies (Ospreys/ Pontarddulais Comp/ Pontarddulais), Josh Cole (Ospreys / Neath Port Talbot College / Tonmawr)
Matthew Aubrey (Ospreys/ Gower College/ Pontarddulais), Carl Lewis (Blues North/ Coleg y Cymoedd/ Treorchy), Jarrod Evans (Blues North/ Coleg y Cymoedd/ Pontypridd), Dan Jones (Scarlets / Coleg Sir Gar / Carmarthen Quins), Barney Nightingale (Newport High), Owen Watkin (Ospreys / Bridgend College / Bryncethin), Joe Gage (Ospreys/ Ysgol Gyfun Ystalyfera / Abercrave), Matthew Pearce (Ysgol y Strade / Llanelli Wanderers), Shaun Pearce (Scarlets / Glan y Mor / Bury Port), Rhys Gealy (Ospreys / YG Gwyr / Pontarddulais), Elis-Wyn Benham (Blues/Coleg y Cymoedd / St Joseph's)