Owen Hargreaves knows competition for a place in Manchester City's midfield is red hot.
He had attracted interest from West Bromwich Albion after Manchester United opted not to renew his contract but feels joining City, expected to mount a serious Barclays Premier League title bid this season, is a greater challenge.
Hargreaves, aware competition for places will be fierce, added: "I like to measure myself against the best and I've always taken on challenges - I left Canada for Germany as a kid, I've left comfortable situations.
"It's a fantastic group of players here, and I hope that I'll be a good addition to these guys to help out.
"I've lived in Manchester for four years and this move just fits. You've got to trust your instincts."
