Robbie Neilson praised Jamie Walker's impact as he came off the bench to score Hearts' winning goal in Sunday's 1-0 victory over Inverness CT at Tynecastle.
The Jambos claimed top spot in Group A and will now face Celtic away in the next round of the Premier Sports Cup on the weekend of August 14/15.
Speaking after the match, Robbie said:
"We created loads of chances and were sound defensively. We just didn't have that final moment. We won all our games and haven't conceded a goal. Yes we'd have liked to have scored loads of goals but teams make it difficult and sit in", he explained.
"We have three massive games now with St Mirren in between the two Celtic matches. All eyes are on Saturday now. It's a huge start to the season and we're really looking forward to it."
On Walker's impact, Robbie said:
"I thought Jamie was great when he came on. The game started to open up and he gets into pockets of space. He is probably one of the best we've got when it's like that - taking the ball and driving at defences. He just needs to work on his fitness so he can do that for 90 minutes. To his credit, he is working extremely hard to be as fit as he can be.
"We want him to get to a stage where he's doing that from minute one. Technically, he's probably one of the best players we've got. It's the other side of it we need to continue to work at."
One player missing today was John Souttar, however, Robbie is confident the defender will be back fit for the league opener next Saturday.
"John is fine. It was probably a wee bit too early today for him but he will train on Wednesday with a view to being ready for Saturday."