DUMBARTON 0 MORTON 1 (Graham 75) Substitute Brian Graham had only been on the pitch for two minutes when he struck to score the goal which took Morton into a lucrative fourth round Scottish Cup tie with Glasgow giants Celtic.

That meeting will now take place at a packed Cappielow Park on 9 January, bringing with it a substantial pay-day for the Greenock club.

It was a deserved win for James Grady's side on a dreich afternoon at the New Strathclyde Homes Stadium nestled beneath the castle rock.

And the Ton boss celebrated by punching the air and grinning at the big travelling support.

Once again Morton enjoyed the lion's share of possession but it took them until 15 minutes from the end of the match to finally grab the vital goal.

Manager James Grady said: "The performance up to the goal was okay. We were passing it well and creating chances - just not taking them.

"You always know that if you are creating chances the law of averages tells you you're going to take one at some stage.

"We told the boys at half-time to be patient. We didn't need to win the game in the next five minutes.

"Be patient and we would create more chances and one of them would hopefully go in.

"And to be fair to big Brian [Graham] he comes off the bench and - I don't know if it was his first or second touch - gets a great header." Grady felt the team had played some good football and said: "I think there's been decent deliveries today.

"I think young Carlo [Monti] played really well coming back in. One of the reasons he was in was for his delivery.

"We just need to be a wee bit more aggressive and have real belief we are going to actually score. Because we are a big side in terms of set plays and we have proven now over the piece that we can pass as well.

"Up to we scored we passed it well enough, created enough chances. But after the goal we changed again. We stopped doing the things that were getting us joy.

"It was a wee heart-scaring moment for myself, but again the most important thing was to get through to the next round and that's what we've done.

"It's fantastic for the club, the players, the management and the fans. Now we can look forward to it [the tie against Celtic]. It's a great one to pit your wits against the best.

"But it's a long way away. We'll enjoy tonight but, come tomorrow, we'll be focusing on the Ross County game on Tuesday night." Sons boss Jim Chapman summed up afterwards when he said: "Sometimes you need a wee bit of luck, but I think the difference between the two teams was just one real good piece of quality - a great cross and a good finish.

"Over 180 minutes I think we showed we were capable of matching them. We didn't create as much as we wanted but sometimes it's difficult to open up.

"The players gave everything they had. We have to take that forward now into our Second Division campaign."