On 19 January 2018, Świerczok completed a move to Bulgarian club Ludogorets Razgrad for €1 million on a long-term contract.

[6] On 6 April 2018, coming as a substitute, he helped his team to take the title derby against CSKA Sofia by scoring 2 goals for the 3–2 win.

[11] Shortly after, on 10 February 2023, he returned to Zagłębie Lubin on a deal until the end of the season, with a one-year extension option.

[14] On 30 September, in a match against Ōita Trinita, he left the pitch after 24 minutes after suffering a lateral collateral ligament tear in his right knee.

[21] In March 2020, Świerczok and his girlfriend helped out a 73-year-old woman who had fainted near her home in Razgrad, by moving her away from the road and calling the medical emergency services.