CREATE TABLE table_34992 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game Site" TEXT, "Attendance" FLOAT)

Who was the opponent at the game at Sullivan Stadium before week 11?
SELECT "Opponent" FROM table_34992 WHERE "Week" < '11' AND "Game Site" = 'sullivan stadium'
SELECT "Opponent" FROM "table_34992" WHERE "Game Site" = 'sullivan stadium' AND "Week" < '11'