user: Question: Who was the opponent at the game at Sullivan Stadium before week 11?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Game Site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 4, 1983', 'at New England Patriots', 'W 29–23 OT', '1–0', 'Sullivan Stadium', 45526.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" < 11.0 AND "Game Site" = 'Sullivan Stadium';