The Chief Rabbi added he was "grateful" to Rabbi Ginsbury for reading the hesped.
During his eulogy, Rabbi Mirvis said: "Mere words cannot do justice to Rabbi Sacks contribution to this world." He described him as a "remarkable spiritual leader, educator, author, broadcaster and mentor.
"An outstanding ambassador for Judaism."
Rabbi Mirvis wrote it was "difficult if not impossible to think of Rabbi Sacks in the past tense."
The Chief Rabbi's spokesperson confirmed he was "saddened" not to be able to deliver his hesped at the funeral.
He said Rabbi Mirvis was in "very good health" but was careful to abide by the official Covid-19 regulations.