The Baggies forward already has two to his name this campaign, while Swansea as a team have yet to get off the mark.
"Danny Graham is a good goalscorer and has had an unlucky start to the season," Long told the WBA website.
"He has done everything right but the ball's just not hit the back of the net.
"Every striker knows how that feels.
"I'm sure he'll be gunning for us tomorrow to get off the mark."