NEW YORK, March 22 (Reuters) - The euro fell 1 percent to a session low against the yen on Monday with the single currency still pressured by concern about whether Greece will be able to secure aid this week to help service its ballooning debts.

The euro was last down 1 percent against the yen at 121.23 yen after going as low as 121.16 yen eurjpy=. The euro was last down 0.4 percent at $1.3478 after also hitting a session low against the dollar at $1.3464. (Reporting by Nick Olivari, Editing by Chizu Nomiyama)