Euroyen futures gave up early gains on Monday after the Bank of Japan's June tankan survey generally matched forecasts, reinforcing market views that the central bank may raise interest rates as early as August.

The headline diffusion index (DI) for big manufacturers' sentiment was plus 23, unchanged from the reading in the March survey and matching the market's median forecast.

Lead March euroyen futures eased 0.005 to 98.870 after the tankan was released.

September futures inched up to a three-week high, rising 0.08 point to 132.09 in early trade.

Swap contracts on the overnight call rate showed a 75 percent chance of a rate rise in August, down slightly from 77 percent on Friday.