If Ireland avoid defeat against the Scots at Markets Field they will seal one of the top two places in Qualifying Round Group 1. The top two from each group progress alongside the third-placed team with the best record against the top pair in their group.
Doolin's side bounced back from a first day 1-0 loss to Slovenia to beat Latvia 3-0 on Friday. Scotland beat Latvia 2-0 then lost 1-0 to the Slovenians. A draw would see Ireland progress on goal difference.
"Everybody is in good shape. The injuries have cleared up, Dan Casey has been given the all-clear after meeting the specialist after suffering a facial injury against Slovenia," said Doolin.
"Scotland are obviously a good group of players as can be seen by them reaching the UEFA U17 Championships semi-finals two years ago and recently did well in a tournament in Germany. They were worthy winners against Latvia and maybe unlucky against Slovenia.
"They have very good attacking players and wide players. Defensively they've just conceded one and looked a good side. They've good players but so have we.
"Our lads have been great. I feel they should be qualified already as we were very unlucky against Slovenia but couldn't score. We haven't done the job yet and it'll be a tough game.
"They're a lot better now as a group than we were earlier in the season. We're creating chances and playing well despite the testing weather. We'll go into the game looking to get a result to qualify."
RESULTS & FIXTURES
UEFA U19 Championships Qualifying Round Group 1
Friday, November 13
Scotland 2-0 Latvia
Republic of Ireland 0-1 Slovenia
Sunday, November 15
Slovenia 1-0 Scotland, Markets Field, Limerick
Republic of Ireland 3-0 Latvia, Eamon Deacy Park, Galway
Wednesday, November 18
Scotland v Republic of Ireland, Markets Field, Limerick (3.30pm)
Latvia v Slovenia, Eamon Deacy Park, Galway (3.30pm)