Nothing, in 1991 he was already 70 years old. He laid in the hospital.
From the interview in Komsomolskaya Pravda, 2011
Почему ГКЧП провалился?
Потому что они не были связаны с партийными организациями. Партийные организации на местах ждали сигнала. Я в это время в больнице был, но я знаю настроения людей.
"Why did the GKCHP fail? Because they were not connected with party organizations. Party organizations in the field were waiting for a signal. At that time I was in the hospital, but I know the mood of the people."
BTW. This is not right, saying that GKCHP's coup was against Gorbachev. The primary target was Yeltsin. The fact is, they didn't arrest Gorbachev, because sought a way to cooperate with him. Of course, he was considered too weak to keep the seat for a long time. But as the future events showed, Gorbachev was going to lose in any case.