Toni Kallio is known for his forward runs and good heading, given his tall frame. However, he is also known for making occasional blunders in the national team as he has been forced to play out of his preferred position.

He has played for TPV Tampere FC Jazz on loan, HJK Helsinki in Finland's Veikkausliiga, Molde FK in 2007, he briefly went on trial at Lokomotiv Moscow and played 3 times. In 2007 he moved to Young Boys in Switzerland.

On 31 January 2008, Kallio joined Fulham on loan. He made his Fulham debut the following season against Arsenal, in which he helped secure a 1-0 victory. On 3 July 2008, Kallio signed a two-year deal with Fulham.

Kallio joined Sheffield United on a one month loan deal in late November 2009, making his debut just over a week later at Plymouth. After making two appearances, Sheffield United extended his loan deal until the end of January 2010 but within hours Roy Hodgson recalled Kallio due to injuries in defence.

On 1 February 2010, Kallio once again joined the Blades on loan until the end of the season.

On 1 July 2010, Fulham announced that Kallio had been released from his contract with Fulham.

Currently (6 Sept 2010) on trial at Welsh club Cardiff City who play in the Npower Championship

Season	League				FA Cup				Lg Cup				Europe				Other				Total
	P	G	Y	R	P	G	Y	R	P	G	Y	R	P	G	Y	R	P	G	Y	R	P	G	Y	R
2009/2010	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0
2008/2009	2	0	0	0	0	0	0	0	2	0	0	0	0	0	0	0	0	0	0	0	4	0	0	0
2007/2008	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

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