Burnley, however, is more interested in a permanent sale.
A second offer from Union Berlin is now being considered on the German team's side of the table.
So far this season, Czech Republic international striker Vydra has managed fourteen appearances for the Clarets, scoring three goals. In the Premier League, he has appeared ten times.
Despite their injury problems this season, Union Berlin are enjoying an outstanding Bundesliga campaign and currently sit in fifth position on the table, just a point away from third place Bayer Leverkusen.
- updated January 19