The Stoke City winger, who joined the Tykes on New Year's Day, will now remain at Oakwell until April 3.
He will make his third Championship start in tonight's home clash with Blackburn Rovers.
USA international Shea joined Stoke in a £2.5m deal from Major League Soccer side FC Dallas in January 2013.
He has made just five first-team appearances for the Potters.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Leeds UnitedLeeds | 20 | 12 | 5 | 3 | 36 | 14 | 22 | 41 |
| 2 | Sheffield UnitedSheff Utd | 19 | 12 | 5 | 2 | 27 | 11 | 16 | 39 |
| 3 | Burnley | 20 | 10 | 8 | 2 | 24 | 7 | 17 | 38 |
| 4 | Sunderland | 20 | 10 | 7 | 3 | 29 | 15 | 14 | 37 |
| 5 | Blackburn RoversBlackburn | 19 | 10 | 4 | 5 | 23 | 17 | 6 | 34 |
| 6 | Middlesbrough | 20 | 9 | 4 | 7 | 34 | 25 | 9 | 31 |
| 7 | Watford | 18 | 9 | 3 | 6 | 26 | 24 | 2 | 30 |
| 8 | West Bromwich AlbionWest Brom | 19 | 6 | 11 | 2 | 21 | 14 | 7 | 29 |
| 9 | Swansea CitySwansea | 20 | 7 | 6 | 7 | 21 | 19 | 2 | 27 |
| 10 | Norwich CityNorwich | 20 | 6 | 8 | 6 | 35 | 30 | 5 | 26 |
| 11 | Bristol City | 20 | 6 | 8 | 6 | 25 | 25 | 0 | 26 |
| 12 | Sheffield WednesdaySheff Weds | 20 | 7 | 5 | 8 | 23 | 29 | -6 | 26 |
| 13 | Millwall | 18 | 6 | 7 | 5 | 20 | 16 | 4 | 25 |
| 14 | Luton TownLuton | 20 | 6 | 4 | 10 | 23 | 35 | -12 | 22 |
| 15 | Coventry CityCoventry | 19 | 5 | 6 | 8 | 25 | 27 | -2 | 21 |
| 16 | Derby CountyDerby | 20 | 5 | 6 | 9 | 22 | 26 | -4 | 21 |
| 17 | Stoke CityStoke | 20 | 5 | 6 | 9 | 21 | 26 | -5 | 21 |
| 18 | Preston North EndPreston | 19 | 3 | 10 | 6 | 18 | 26 | -8 | 19 |
| 19 | Oxford UnitedOxford Utd | 18 | 4 | 6 | 8 | 20 | 28 | -8 | 18 |
| 20 | Queens Park RangersQPR | 19 | 3 | 9 | 7 | 18 | 26 | -8 | 18 |
| 21 | Portsmouth | 18 | 3 | 8 | 7 | 21 | 30 | -9 | 17 |
| 22 | Cardiff CityCardiff | 18 | 4 | 5 | 9 | 17 | 28 | -11 | 17 |
| 23 | Plymouth ArgylePlymouth | 19 | 4 | 5 | 10 | 19 | 40 | -21 | 17 |
| 24 | Hull City | 19 | 3 | 6 | 10 | 17 | 27 | -10 | 15 |
| > Championship Full Table | |||||||||
