Defender Long out with minor knee problem
The 26-year-old has made only one appearance this season – in the EFL Cup exit at former club Accrington Stanley – with Michael Keane, Ben Mee and James Tarkowski ahead of him in the pecking order.
And Sean Dyche revealed after Tuesday’s 2-0 win over Sunderland that he will be unavailable until around the start of February.
Dyche said: “He’s just had a minor bit of scar tissue on his knee tendon, he’s had that taken out.
“It’s quite a normal thing.”
Asked how long he would be out, Dyche added: “Probably a few weeks, he’s going well.
“It’s a backlog of his injury, the stress that goes through the tendon after the op.
“It was more of a niggle.”
Long suffered a cruciate knee ligament injury on New Year’s Day 2015, but returned last season on loan at Barnsley and then MK Dons.