Duffy scored 27 goals in 55 starts for Falkirk

The 22-year-old former Rangers and Falkirk player will stay until the end of the season after receiving official Football League clearance.

Duffy has made just nine starts since joining from Falkirk in January, but scored five in 10 games in a loan spell with Hartlepool earlier this season.

The Glaswegian goes straight into the Swansea squad for Saturday's visit of Northampton and should make his debut.

Duffy's arrival eases the striker crisis at the Liberty Stadium, where Pawel Abbott is the only other fit and available senior striker.

Adebayo Akinfenwa is out for the season with a broken leg, while Lee Trundle picked up a two-game suspension for his dismissal in the 2-0 win at Tranmere on 10 March.

Duffy made just three substitute appearances at Rangers, where he started his career.

He joined Falkirk in 2004, where he scored 27 goals in 55 starts.

Swansea captain and central defender Garry Monk had to leave the pitch during Wednesday night's reserve team game against Cheltenham at Port Talbot.

Monk had hoped to play the full 90 minutes as he makes his comeback from a knee injury.