A bidding war could be on the cards for British pharmacy chain Alliance Boots.
The company, which also has a substantial operation in the Republic of Ireland, is reported to be thinking about opening up its books to a rival bidder to Kohlberg Kravis Roberts (KKR), which has already put more than £10 billion on the table.
The Wellcome Trust and Guy Hands's private equity group Terra Firma are understood to have asked to see the accounts; it is said a decision will be made this week.
It is believed that Celesio, the German owner of the Lloyds pharmacy chain, is also considering an approach.
KKR increased its offer last month after an earlier bid was dismissed as too low.
Alliance Boots has now opened its books to KKR, which is working with Boots deputy chairman Stefano Pessina - he already owns 15 per cent.
Alliance Boots is an attractive target because of its strong presence on the High Streets.
But since its £7 billion tie-up with Alliance Unichem last year, it is now also a major drugs wholesaler.