UPDATE 1-Glencore takeover of Viterra may close later-Agrium

* Source near Glencore says still working for July close

* Agrium CEO says took competition concerns into account

By Rod Nickel

June 13 (Reuters) - Glencore International PLC's takeover of Viterra Inc may close in August, slightly later than expected, the chief executive of Agrium Inc said on Wednesday, but a source close to Glencore said the company is still working toward closing the deal in July.

The C$6.1-billion ($5.9 billion) takeover requires the Canadian government's approval, and a competition review of Glencore's side deals to sell some assets to Agrium and Richardson International Limited will begin after Glencore's transaction closes, Agrium CEO Mike Wilson told the company's investors in Chicago.

"We were hoping (Glencore) would close in July, it might drag into August," Wilson said, who did not say why he thinks the Glencore-Viterra deal might be delayed.

"Can't wait to get Viterra into the fold."

Agrium would acquire 232 of Viterra's Canadian farm-supply outlets, 17 farm outlets in Australia and a minority stake in the Canadian Fertilizers Limited plant at Medicine Hat, Alberta, for C$1.15 billion ($1.12 billion).

Other Viterra assets, such as some Canadian country grain elevators, would go to Richardson International Limited.

Once Glencore's takeover of Viterra closes, Canada's Competition Bureau would begin a 45-day review of Glencore's deals with Agrium and Richardson, Wilson said.

Some Canadian farm groups have raised concerns about competition in the retail fertilizer sector after Agrium's purchase, but Wilson said it is no coincidence that Agrium is not buying all of Viterra's farm-supply assets.

"We have tried to accommodate the Competition Bureau on areas where we feel they may have concern."

Agrium's deal with Glencore is likely to close in the fourth quarter, Wilson said.