Tom Cairney has only made 2 appearances for the national side, and has struggled to transfer his Fulham form onto the international stage.
Grant insists the 27-year-old midfielder has a lot to offer Scotland, remarking: "The biggest skill he's got is the fact he is comfortable in possession of the ball. Fulham play in a certain style, they have done it for the last few years, and Tom fits into it fantastically well.
"He is very much a creator of opportunities, he is also a goalscorer and he has proved that over the past couple of years - player of the year and Championship team of the year.
"I think the Costa Rica game, we didn't see the best of him. You need people running by Tom so he can step in and get on the ball. We have got to build a team round about the facts that help these guys be at their best.
"To create space, other people have got to move out your space, and give the ball early. He picks up fantastic spaces between the lines and turns and faces the opposition.
"He is more than capable and the great thing he is playing at the highest level, playing against top international players week in, week out. That can only make you think better.
"He is training with a group of players now at Fulham which is much stronger than last season, we spent £104million.
"So all of a sudden you are playing against better players in training and you have to make sure you are in the team week in, week out."