on 8 february 2007, he moved to huddersfield town on an emergency loan deal. on 24 march, he was sent off against brighton & hove albion in a match which finished 0–0. upon his return to burnley, he was released on a free transfer. sinclair signed a one-year contract at huddersfield town on 14 may. he cited manager andy ritchie as a reason for staying on: "he's been successful in league one before", he told htafc.com. on 6 october 2007, he received his second red card of his short career at the galpharm stadium, in town's 4–0 drubbing at the hands of walsall at the bescot stadium. he received his third during town's 4–1 defeat by southend united at roots hall on 5 december 2007. huddersfield released sinclair at the end of his contract in may 2008.