Teams will be allowed to use a maximum of five substitutes, with a sixth substitute allowed exclusively during extra time. Each team may use a maximum of three stoppages in play to make substitutions (half-time and full time, as well as half-time in extra time, do not reduce the number of stoppages in play that can be used). An additional stoppage may be used during extra time.
https://www.uefa.com/uefaeuro-2020/news/0269-126056345f3d-cbd4b7ed8458-1000--euro-rules-you-might-not-know/
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