Career
Wojtkowski started playing football at his local team, OSiR Sokołów Podlaski. In 2010, he joined Legia Warsaw, where he spent four years. Kamil joined Fulham Football Club youth squad during summer 2013, where he trained and played for about half of the year however, Legia nad Fulham were unable to reach the terms so Wojtkowki returned to Poland to join Pogoń.
In 2014, Wojtkowski joined Pogoń Szczecin.
On 18 October 2014, he made his Ekstraklasa debut for Pogoń, coming on as a substitute in second half of away match against Jagiellonia Białystok. By doing so, he became youngest player ever to make appearance for the club, aged 16 years and 234 days.
On 29 June 2015, Wojtkowski signed for 2. Bundesliga club RB Leipzig.