BANKING Plans for an £89bn merger of Barclays and ABN Amro came under more pressure after the Dutch bank's shares surged on hopes of a rival offer.

The prospect of a potential counter-bid from the trio of Royal Bank of Scotland, Belgium-based Fortis and Spain's Santander lifted ABN's shares by more than six per cent to £24.37.

This is above the 35 euro-a-share offer most analysts think Barclays can afford.

The two banks are already racing to seal an agreement before tomorrow, when their period of exclusive talks over a deal to create the world's fifth largest bank ends.

Charles Stanley analyst Nic Clarke said that the two banks had to walk a "difficult tightrope" between a low Barclays offer, which would spark demands for talks with the rivals, and too high a bid, which would hit Barclays' own share price.

Barclays has already offered concessions to the Dutch bank, including moving the combined company's headquarters to Amsterdam.

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