[1] The Baltimore Ravens signed Mekari as an undrafted free agent, as he was not selected in the 2019 NFL draft.

[2] After a strong camp and preseason while showing off his versatility, Mekari made the Ravens initial 53-man roster, extending the streak of undrafted players making the Ravens roster to 16 years.

[3][4] After coming in to the game against the Los Angeles Rams in Week 12 in the 2019 season for an injured Matt Skura, Mekari made his first start at home against the San Francisco 49ers when Matt Skura was placed on season-ending injured reserve.

[5] During the 2020 season, Mekari was placed on the reserve/COVID-19 list by the team on November 25, 2020,[6] and activated on December 4, 2020.

On December 30, 2021, Mekari signed a three-year contract extension with the Ravens.