Post-Christmas rugby games and Welsh Grand National are among events which will have no crowds.
Plaid Cymru's sports spokeswoman Heledd Fychan said it was important sports clubs were supported.
On these new restrictions, Mr Gething said: "Sporting events over the Christmas period are one of the big highlights of the year. Unfortunately, the new Omicron variant is a significant development in the pandemic and could cause a large number of infections."We need to do everything we can to protect people's health and control the spread of this awful virus.
The Welsh government said further details about the £3m support package would be made available following discussions with the sector.It added that a sporting event referred to all indoor and outdoor sporting events, whether ticketed or not, with spectators. First Minister Mark Drakeford has warned of "a gathering storm" of Omicron infections after the Christmas period and has already announced that nightclubs will shut down at midnight on Boxing Day.
"It's not just about hospitalisations and people getting sick, of course that's really important, it's also all these staff absences that we're starting to see and the impact that's having, not only on essential services but on life in general." He said many people were behaving cautiously and lateral flow tests were a really important tool in making Christmas safer, but said vaccination itself is not enough.
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