The young striker marked his first start for the Under-21s with a hat-trick as the Young Lions secured a convincing 4-0 victory in Serravalle on Thursday night.
The squad will now switch San Marino for Suffolk as they face Lithuania in another Euro U21 Championship 2015 qualifier at Portman Road.
“I think it will be similar to the San Marino game, I’m sure Lithuania will sit in, look to defend and we’ll have to go out there and do another professional job,” said Harry, who is joined the squad by Tom Carroll, who set-up his hat-trick goal against San Marino.
“It we do that and play to our ability, I’m sure we can get another win.
“Everyone is focused and if I get the nod, I’ll be looking to get amongst the goals again.
“I haven’t had much time to think about scoring the hat-trick. We’re straight into preparing for another important qualifying game and that’s all I’ve been concentrating on.
“Hopefully we’ll get the win and I’ll get on the scoresheet again.”
Meanwhile, goalkeeper Jordan Archer started again for Scotland Under-21s and saved a penalty against Georgia in European qualifying on Monday, but Scotland lost 2-1 in Tbilisi. Scotland have now won two and lost two of their matches in Group Three.