He soon broke into the side as a regular, playing with the likes of Lennart Skoglund and Tom Turesson, and Hammarby won a promotion to Allsvenskan the same year.

He made his debut in Allsvenskan in 1967, playing all but three league fixtures throughout the campaign, but Hammarby finished at the foot of the table and suffered an immediate relegation.

[10] Kenneth Ohlsson grew out to become the club's star player, together with goalkeeper Ronnie Hellström, but Hammarby would fail to produce any sort of challenge for the Allsvenskan title in the upcoming years.

[12] Many pundits thought that Ohlsson would get called up to the 1978 FIFA World Cup the same summer, but manager Georg Ericson ultimately left him out of the squad.

With players like Klas Johansson, Mats Werner, Thom Åhlund, Thomas Dennerby, Michael Andersson, Ulf Eriksson and Mikael Rönnberg – Hammarby started to establish themselves as a contender for the Allsvenskan title the upcoming seasons.

In the finals against IFK Göteborg, Hammarby won 2–1 in the first leg away, but lost 1–3 in the home game at Söderstadion to a record crowd, missing out on the gold medal.

[11][17][18][5][19] After his playing career ended, Ohlsson stayed with Hammarby and worked as the assistant to manager Björn Bolling in 1985, securing a 6th place in the Allsvenskan table.

[20] Back in Allsvenskan 1990, Ohlsson was unable to rescue Hammarby from an instant relegation, with a squad consisting of several homegrown youngsters due to financial difficulties.

Ohlsson stayed as manager of Hammarby for two more seasons in Division 2, but was unable to lead the club back to Allsvenskan and left his position at the end of 1992.

[20] He later held different coaching positions at several lower-level clubs based in Stockholm County: IF Brommapojkarna, Reymersholms IK, Assyriska FF and Hanvikens SK.