Burton Albion are keen on signing Millwall midfielder Adam Bolder, BBC Radio Derby understands.Former Derby County player Bolder was a guest of the Brewers at Saturday's 1-0 friendly defeat against the Rams.
The 29-year-old, who spent a seven-year spell with Derby, has fallen out of favour at the Den and last season spent three months on loan with Bradford.
Bolder has made more than 320 career appearances and has also played for Hull, QPR and Sheffield Wednesday.