The imminent sale of Sonny Perkins to Leyton Orient will see Daniel Farke gain a boost to his Leeds United transfer criteria project in the final days of the winter window, amid speculation about Rasmus Kristensen's future.

Recent reports in Germany have suggested that loan club Eintracht Frankfurt wish to re-negotiate a fee for Kristensen in an attempt to lower an apparent pre-arranged £13million buy-out figure - albeit this claim has not yet been substantiated.

BILD suggests that Frankfurt intends to touch base with Leeds and discuss a lower fee, perhaps under €10m (£8.4m). It is unclear whether Frankfurt intend to reach out to United before the winter deadline of 11pm on Monday, February 3.

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Right-back Kristensen has registered two goals and three assists in 24 matches for Frankfurt this season. His Leeds contract does not expire until 2027.

Though his future is clearly not yet decided, there is an expectation that Kristensen might be bound for an exit from Elland Road given he has not played under Farke at Leeds, and so the club might soon have more money to play with.

If an unlikely deal does happen before next Monday, then the United boss would be handed a financial boost within his January transfer budget amid the looming exit of Perkins. Speaking earlier this month, Farke outlined what he is looking for in any new signing this winter.

He said: “The rules are quite clear. First of all, the quality has to be right. It's not like we just add numbers, otherwise we could easily take our own talents from the under-21s. It has to be a really proper quality.

“Then the character has to fit into the group. The attitude has to be at the top level. The third thing is that the player is affordable. So all these three things come together in order to make a signing.”

Of course, any income Leeds receive would help in increasing their affordability scope. The club are in good standing within finance regulations anyway.

United forecasted a quiet January window and that is expected to stay the case for the final few days of the window, although Farke suggested he could deliver a transfer update in today's press conference ahead of Cardiff City on Saturday.