The Peru international became the London club's second signing of the close season after Reading midfielder Steve Sidwell moved to Stamford Bridge on another free transfer last month.

"I think it's very important for me to win some titles and I have the chance to win them here," Pizarro told the club's official Web site (www.chelseafc.com).

Chelsea completed the FA Cup-League Cup double last season, finished second in the Premier League and reached the semi-finals of the UEFA Champions League.

The Peruvian joined Bayern in 2001 after a two-year spell at Bundesliga rivals Werder Bremen.

He scored 15 goals in each of his first two seasons in Munich but has since found them harder to come by, netting 41 in the league in the next four campaigns.

Pizarro will be reunited at Chelsea with former Bayern colleague Michael Ballack.