Celtic boss Ronny Deila says keeping his best players will take priority over acquisitions in the transfer window.
Chelsea striker Fernando Torres is understood to be set for a return to Atletico Madrid, according to Sky sources.
Leeds are expected to confirm the club's £52million takeover by Bahrain investment bank GFH Capital on Friday morning at a press conference at Elland Road.
The West Yorkshire club announced at the end of last month that GFH Capital's 100 per cent takeover would be completed on December 21, with current owner Ken Bates to stay on as chairman until the end of the season during a transitional period.
GFH Capital deputy chief executive David Haigh, who became a director at Elland Road on November 21, is expected to be joined on the board by three more of the Middle East consortium's representatives.
A new club chairman will be appointed by the new owners at the end of the season when Bates will become club president.
GFH Capital, who first entered into talks with Leeds in May, have already transferred money into the club and will be making further funds available to manager Neil Warnock, who will have the new owners' full support.