The 21-year-old moved to the Liberty Stadium over the summer from Arsenal and made his debut for the club in the League Cup.
Bartley has previously spent spells on loan at Sheffield United and Rangers and has represented England and Under-16 and Under-17 levels.
|SWANS' WINGS CLIPPED?|
|8/1||Swansea City are 8/1 with Bet365 to lose 2-1 to Aston Villa|
The former Mallorca boss has brought in former Twente defender Dwight Tiendalli on a free transfer to boost his options.
Swansea have enjoyed an impressive start to the season, taking seven points from their opening three games and face Aston Villa at Villa Park at the weekend.