* Former Chelsea midfielder leaving next month
* Lampard has helped us greatly, says Vieira (Adds para nine)
NEW YORK, Nov 14 (Reuters) - New York City coach Patrick Vieira saluted Frank Lampard after the former England and Chelsea midfielder announced on Monday he will be leaving the Major League Soccer team when his contract expires next month.
The 38-year-old Lampard, signed in 2014, suffered with injuries during his time in the U.S. but scored 15 goals in 31 appearances for New York City.
"Everybody talks about Frank's goalscoring record but I can tell you, after a year of working with him, he brings so much more to a team than just goals," former France midfielder Vieira told the club website (www.