A motorcycle accident in Rome, Italy during the summer of 2002 nearly killed Jansen and long-term hospitalisation followed (he spent six days in a coma). In the seasons after the accident he struggled to regain his place in the Blackburn side which led to him being loaned to Coventry City in 2003, where he scored 2 goals in 9 appearances. He made another attempt to force his way into the Blackburn team at the start of the 2004–05 season, scoring 2 goals in 8 appearances. However, it was felt that he had still not recovered mentally from the accident and was struggling to cope with the pressures of Premier League football. As a result, Blackburn decided it best for him take another break from football and sent him to visit a sports psychiatrist in the US.