
Sadler has guided the Saddlers to the top of Sky Bet League Two, with his side enjoying a strong spell that has not only seen them rise in the table, but also impress in the various cup competitions, earning victories over a string of League One clubs.
Millwall are already in the market for a new boss, as current gaffer Neil Harris is set to step down following this weekend’s Championship clash between the Lions and Middlesbrough.
Meanwhile, Northampton are seeking a replacement for former boss Jon Brady after he quit the League One club last week, with the Cobblers currently sitting seventeenth in the League One.
39-year-old Sadler has done exceptionally well on a small budget and is believed to have drawn the interest of other clubs as he continues to guide the Saddlers back towards the third tier.