Jonathan Tiernan-Locke questions Team Sky TUE stance

Team Sky's stance in allowing Sir Bradley Wiggins to take a banned drug to treat his asthma has been questioned by one of their former riders.

Jonathan Tiernan-Locke, who rode for Team Sky until he was sacked for a doping violation in 2014, says the matter has tainted the outfit's image.

Wiggins was granted a therapeutic use exemption (TUE) to take triamcinolone before his 2012 Tour de France win.

TUEs let athletes take prohibited substances if there is a medical need.

In an exclusive interview with BBC Sport, Tiernan-Locke - once tipped as a possible heir to Wiggins - claims Sky have been less than transparent about the use of TUEs.

Tiernan-Locke, now 31, also discusses his own troubles, insisting he is "100%" innocent of doping despite being handed a two-year ban for irregularities in his blood passport.

WATCH MORE: Extended interview with Tiernan-Locke