Nigel Winterburn: Why it didn't work for Kieran Tierney at Arsenal

Former Arsenal left-back Nigel Winterburn discusses Kieran Tierney's struggles with the Gunners.
The Scotland international left-back is leaving Arsenal and the Premier League at the end of the season to return to former club Celtic. Once regarded as among the best young left-backs in Europe, Tierney has seen his career stall in recent seasons.
Winterburn says he remains a fan of the Scot and discusses why he believes things at Arsenal didn't develop as hoped.