Oxford will submit its formal bid to become UNESCO World Book Capital in 2014 this week.
However, CVC added that there was no certainty it would make a formal bid.
Ex-Thailand Prime Minister Thaksin Shinawatra is reported to have lodged a formal bid for the club.
Kraft will undoubtedly raise its offer once it has gauged reaction to its formal bid.
Oyston believes the speculation is an attempt to unsettle the 26-year-old and insisted no formal bid had been lodged.
Costain said it was now uncertain whether it would make a formal bid.
Barclays and Bank of America are seen as the two most likely candidates to step up, but a formal bid has yet to materialize.
Mr Boparan's company, Boparan Holdings, said there was "no certainty" at this stage that it would make a formal bid for Northern.
Its sale was announced in June and Cherwell District Council has confirmed it is helping BCH prepare a formal bid for later this year.
After scrutinising the details, Northrop and EADS came to the conclusion it was no longer worth their while going through the motions of submitting a formal bid.
Although there has been talk of six bidders, only four have been identified and it is likely that so far they have registered expressions of interest rather than submitting a formal bid.
That's seen as an important move, because if Novartis were to buy a full 33% of Roche, it would be compelled under Swiss law to make a formal bid for the shares it didn't own.
On Monday morning, Cadbury is expected to make a formal rejection of that Kraft offer but is unlikely to comment on any talks with Hershey as no formal bid has been tabled by the company yet.
Ms Davidson, who was newly elected to the Scottish Parliament in May, is expected to make a formal announcement about her bid on Monday.
Foreign Minister Nkosazana Dlamini-Zuma, Sports Minister Ngconde Balfour and Presidency Minister Essop Pahad will be in a 50-member South African delegation that flies to Zurich this month for the formal presentation of its bid.
If the bid proposal becomes a formal offer, it looks unlikely that Sanofi will have to face a higher counter-bid.
President Barack Obama's formal declaration of his re-election bid Monday actually serves as a reminder that the 2012 campaign is off to such a slow start that it has shattered one piece of conventional wisdom: the notion that each presidential sweepstakes starts earlier than the last one.
As the future on the stadium reaches another landmark on Wednesday, when the formal process of finding a long-term tenant starts, the controversial Hammers bid appears to be among the front-runners.
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