Somerfield has already rejected an offer from Baugur

The news follows speculation earlier in the week that property tycoon Robert Tchenguiz may offer to buy the company.

In a statement, Somerfield said it had "recently received further proposals regarding possible cash offers".

The Bristol-based firm added it would investigate the offers and make a further announcement in due course.

Somerfield shares were up 6.4% at 207 pence by the close of trade on Thursday.

Earlier in the week, Somerfield's shares reached 201.5 pence - at the time a five-and-a-half-year high - amid rumours that Mr Tchenguiz and his brother Vincent could bid for the company.

Bid speculation

Newspaper reports have said the Iranian-born investor is considering a bid worth between 205 pence and 210 pence.

However, Mr Tchenguiz may hold off from making a formal bid until the Competition Commission decides whether to approve Somerfield's recent purchase of 114 Safeway stores.

See Somerfield's share price

Meanwhile, reports from news agency Reuters said a further new suitor involving property developers Ian and Richard Livingstone could make a 190-pence-a-share offer.

Another potential suitor is Icelandic retail group Baugur, which last month said it was considering a new bid for Somerfield after its original �1bn takeover offer was turned down.

Somerfield rejected Baugur's plan, saying it "would not be in the interests of shareholders".

Baugur already owns a 5% stake in Somerfield, which operates 500 Kwik Save stores as well as 700 shops under the Somerfield brand.

It is the second time in less than two years that Somerfield has rejected a takeover approach.