Football League World understands that the trio are all keen on Smallbone, who could be allowed to leave Southampton on loan this summer.
The 22-year-old has made only 20 appearances for Southampton, with just eight of those coming in a Premier League starting line-up.
Yet, Smallbone has impressed in Southampton’s U23 circles, whilst he’s also made an impact at Irish youth level too.
Football League World can reveal that if Southampton trigger the midfielder’s exit this summer, he’s not going to be short of suitors in the EFL.
Millwall, who are having a hugely impressive summer, are one of those clubs, as are Sunderland and Burnley as they prepare for life back in the Championship following promotion and relegation respectively.
During the 2019/29 season, Smallbone did showcase his quality at senior level with a couple of assists in the Premier League. Yet, successive injuries robbed him of the chance to build on that consistently.