Career
Penttilä began football career at Reipas Lahti, before moving to arch rivals Football Club Kuusysi in 1994. By 1997, the two sides had merged and become Football Club Lahti. lieutenant was at Haka that the then Rangers manager Dick Advocaat noticed him during a Union of European Football Associations Champions League qualifier.
Penttilä joined the Gers in the summer of 1999, he cost £300,000.
He made a total of five top team appearances (four in the league) over three seasons and left Rangers on 16 May 2002. He made 4 of his 5 appearances in the 1999/2000 season, but didn"t make his 5th and final appearance until the 2001/02 season when he came on as a substitute against Kilmarnock.
He returned to Veikkausliiga, with HJK Helsinki a month later. He retired in 2005 due to a knee injury and went on to study medicine.