Modi arrives in Canada on April 14 for a two -ay visit, the first bilateral visit by an Indian prime minister in 42 years.    

"The negotiation teams are working even today in Ottawa," the source with direct knowledge of the matter said.

Negotiations for the agreement, which seeks to protect legal rights of Canadian and Indian investors doing business in the two countries, were concluded in June 2007, but it has yet to be ratified.

Concerns in New Delhi over certain provisions of the negotiated pact, which allow a foreign investor to sue the host country at an international dispute settlement agency, are believed to be the reason behind the deadlock.

Several investors have taken the Indian government to international arbitration in recent years, citing provisions of bilateral investment protection agreements.

After Modi's victory in national elections last year, the Canadian government said it expected the new Indian leader to finally sign the agreement.

The two countries are also negotiating a free trade agreement, but progress has been slow.

Canada is home to 1.2 million Indians but the size of bilateral trade is a relatively small $6 billion a year.

Modi's trip could also clinch a fuel supply agreement with Canada's biggest uranium producer, Cameco, two Indian sources said.

A similar investment agreement with Europe has been reinvigorated and could be finalised within three months, the first source added.

(Writing by Rajesh Kumar Singh)

By Frank Jack Daniel