The Chiefs placed Kelce on the reserve/COVID-19 list Monday.
According to Adam Schefter of ESPN, Kelce is vaccinated, which means his placement on the list is the result of a positive test. Due the NFL's new COVID-19 return-to-play protocols, Kelce could be cleared in advance of Sunday's game against the Steelers if he's asymptomatic of the virus. For the time being, however, Kansas City's available tight ends are Blake Bell and Noah Gray.