The prop put his hand up for a starring role in the 2013 RBS 6 Nations after making his Scotland front-row debut against Australia in June, helping Robinson's side secure a famous 9-6 victory.
But he was not done there, going on to start the next two clashes - against Fiji and Samoa - boasting a 100 per cent win record in his three caps to date.
However the smile was wiped off his face as he got back to Warriors duty, Glasgow opening the new RaboDirect PRO12 campaign with an 18-10 loss to an Ulster side missing a whole host of international faces.
And the prop admits that the memories of his summer fun have well and truly been erased from his mind.
"That was a first game for myself, Chris Cusiter, Al Kellock and a few others, and there was a bit of rust there," Grant told the Scotsman.
"Hopefully, we've shaken off those cobwebs now and can push on against the Scarlets on Friday.
"This is where it all starts and ends. The summer was great for me, to get my first three caps, and three wins in the southern hemisphere was great for Scotland.
"But we've come back now and hit the ground with a thud with that disappointment of Friday night, and we have to now fix that quicker than we did last season.
"I think it took us four or five games before we found a bit of a stride, and that can't happen this season. If we want to get those top two spots we need to be winning now. It starts on Friday night because we have to win at home.
"That [big Scarlets win] was a bit of a shock result. They have started the campaign very well and they are never an easy team to beat, home or away.
"We know that we're going to have to improve a lot from last Friday, but we're more than capable of doing that and the onus is on us to get that result."