Sinclair has represented his country up to U20 level, and is in contention for elevation to the U21 side when they take on Romania in a two-legged European Championship play-off next month.
"I spoke to [U21 coach] Stuart [Pearce] last week and he is back on the radar for the U21s. Stuart knows Scott's level but I told him if he can tell me a better player in his position at this moment, then I've yet to see him," said Brendan Rodgers, the Swansea manager.
"Scott is a Premier League talent and he's very close to that England call as he is one of the best attackers in the league. I'd expect Stuart to be at one of our games watching Scott very soon."