|Date of birth||September 30, 1963|
|Place of birth||Lodi, Italy|
|Height||1.82 m (5 ft 11 1⁄2 in)|
|1987–1988||→ Monza (loan)||32||(1)|
|* Senior club appearances and goals counted for the domestic league only.
Verdelli started his senior career with amateur club Oltrepò. In 1986, he was signed by Internazionale, but then sent on loan to Monza in 1987; in his season with Monza, he provided a key contribution to the club's historical promotion to Serie B, and was subsequently awarded with a place in the main Internazionale roster for the 1988–89 season. During that season, Verdelli played mostly as a backup, appearing twenty times in the Giovanni Trapattoni-led team that won the Serie A title with just two defeats. In 1990, he left Internazionale for Cremonese, where he played for seven consecutive seasons, became a mainstay and one of the most recognizable footballers of the Grigiorossi team that played in the top flight for four years. He retired in 1998 after a lone season with minor league team Fanfulla.
In 1999 Verdelli started a coaching career as head of Fanfulla until 2001. He was successively appointed youth coach of Internazionale, winning a Campionato Primavera and a Torneo di Viareggio. In 2003, he was named assistant to Héctor Cúper, and served as caretaker for a spare week after the Argentine's dismissal.
In 2004 Verdelli was appointed head coach of Serie B club Ternana, but was replaced by Giovanni Vavassori a few weeks later. He then served as head coach also at Cremonese and Voghera, still with little luck. He successively worked as head coach of amateurs Pontisola in the 2009–2010 Serie D season, leading the club to third place. His return to professional coaching happened in the following season, as he was appointed boss of bottom-placed Lega Pro Prima Divisione club Monza in November 2010; Verdelli however failed to drive the club out of the relegation zone and found himself again in last place a few weeks before the end of the season, being consequently removed from his coaching duties on 30 March 2011.