ROME (Reuters) - Former Prime Minister Silvio Berlusconi is continuing to undergo tests in hospital but is not expected to have heart surgery, a spokeswoman for his Forza Italia party said on Thursday, denying press reports he would need an operation.

The 79-year-old center-right leader and media mogul was admitted to hospital on Monday suffering from what his doctors called a "cardiac deficiency". [L8N18Z1RJ]

In unsourced reports, Italian newspapers said on Thursday that Berlusconi might need an operation in the coming hours after tests had revealed a potentially serious problem. However, Forza Italia spokeswoman Deborah Bergamini dismissed this.

"No operation is expected. What the newspapers have written is not right. It is nonsense," she told Reuters.

"As we already said yesterday, (Berlusconi) is undergoing certain tests. They will be completed today. Presumably he will go home tonight," she added.

(Reporting by Valentina Consiglio; Writing by Crispian Balmer; Editing by Andrew Heavens)