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Jack Colback is not expected to feature for Nottingham Forest against parent club Newcastle United next week.

The Magpies travel down to the City Ground to take on Forest in the second round of the Carabao Cup on Wednesday evening.

United midfielder Colback is currently on loan at the East Midlands club - who have an option to make his move permanent - and the 28-year-old has made three Championship appearances so far this season for Forest.

Unlike Premier League rules - which automatically forbid a player from facing his parent club regardless - EFL regulations stipulate that for a loanee to feature against his parent club in the League Cup, an agreement in writing must be agreed with the Football League.

It is understood that no such agreement is yet in place - it was not written into the loan deal which took Colback to the City Ground for a second temporary stint, and has not been formulated since - and Colback is therefore ineligible to play against Newcastle as things stand.

Whether Forest and United could still come to an arrangement before Wednesday’s game is unclear, although it seems unlikely that the Magpies would agree to allow Colback to play against them.

The Geordie midfielder does not have a future at Newcastle - with Rafa Benitez having told the midfielder more than 12 months ago he was no longer part of United’s plans.

In February - after joining Forest on loan for the first time - Colback alleged Benitez had treated him like a “number rather than a human being” by sending the midfielder to train with the Under-23s at the Academy, while the Spaniard shot back that he had acted in a “professional manner”.

Colback, who is believed to be on more than £40,000 a week, is into the final year of his Newcastle contract.