In 1992, he moved to Lean from Tolsberg. During this season, he played 31 times for Lean and scored 7 goals.

In 1994, Johansson moved to Lillestrom. He played 23 times and scored 4 goals.

In 1995, he joined the Turkish powerhouse Besiktas. He played 22 times and scored 1 goal.

In 1996, Johnson officially joined the Premier League hegemon Manchester United. In the early days of joining Manchester United, few people knew this mysterious defender, but he soon showed that he is a backbone player with a strong sense of position and excellent aerial ability. In 1998, despite being plagued by injuries, he still formed a solid midfield combination with Stam. This year, he, Gary Neville and Berg, who is also from Norway, took turns to serve as the backbone, helping the team achieve the great achievement of the Triple Crown. While playing for Manchester United, he helped the team win 4 English Premier League championships, an English FA Cup championship and a UEFA Champions League championship.

In 2002, after leaving Manchester United, Ronny Johnson joined Aston Villa and played for 2 seasons, but he was still plagued by injuries. Later, he joined Newcastle United as a free agent, but due to poor physical condition, he only played 3 games before being abandoned by Newcastle United. Then he announced his retirement.

In 2005, Ronny Johansson returned to football and returned to the Norwegian Vallelunga Club to continue his football career.