O'Gara converted before his opposite number, Fiji's Seremaia Bai, opened Clermont's account with a 12th-minute penalty.
More damaging would be if Toulouse withhold Wales skipper Thomas and Clermont-Auvergne keep fly-half Jones.
BBC: SPORT | Rugby Union | Internationals | English clubs threaten Wales snub
Clermont Auvergne's bonus-point victory over the Scarlets relegated Wasps to third place in the group.
Clermont regrouped and long-range tries from Aurelien Rougerie and Vilimoni Delasau set up a dramatic finale.
But Julien Malzieu's try helped Clermont move 13-11 ahead and the French side wasted other chances.
The Wasps boss said they face some "tasty" pool games against Munster, Llanelli Scarlets and Clermont.
"The time that was answered best was just after half-time in the Clermont away match, " he said.
Despite Munster's numerical advantage, Clermont did all the attacking in the early part of the second half.
The visitors took the lead through Tim Payne and Haskell before Brock James kicked Clermont eight points clear.
He will miss the regions first four matches of their pool, which includes Clermont Auvergne, Leicester and Viadana.
They include current Test stars James Hook and Lee Byrne who are joining Perpignan and Clermont Ferrand respectively.
For Clermont, who tried for six years to launch Wink the traditional way, results like that are statuesque.
The other two matches are all-French affairs, with Stade Francais hosting Montpellier and La Rochelle facing Clermont Auvergne.
Instead of relying on inefficient direct-mail campaigns like most magazines, Clermont, 37, waged his marketing campaigns on the Internet.
South African Hougaard and Clermont scrum-half Morgan Parra were both guilty of missing kickable penalties in the opening exchanges.
Jerry proceeded to attack the two guys and chase them down Clermont Avenue, his Inverness Cape flying behind him.
They will face either Leinster or Clermont in this year's final which will take place at Twickenham next month.
Hook is joining Perpignan, Byrne is heading to Clermont Auvergne and Henson has already moved to Toulon via Saracens.
Clermont dominated possession early on but without creating a scoring chance of note.
Evans, 34, hit out after the 41-0 loss to Clermont which saw the Scarlets end their Heineken Cup group pointless.
King, a once-capped All Black, has been a Scarlets mainstay but will now join Wales full-back Lee Byrne at Clermont.
The Irish side made the breakthrough shortly after Clermont's Vilimoni Delasau was sin-binned for not rolling away from a tackle.
As Munster changed into the Clermont 22, they had numbers out wide and Horan squeezed his way over the line.
With time running out Clermont became stretched and Rudi Kiel and Mark Cueto both scored to complete a famous win.
Wasps regular David Lemi fills the right wing slot for Samoa while Tasesa Lavea of Clermont will direct operations at fly-half.
In August 1807 the North River Steamboat of Clermont set out from New York Harbor on its maiden voyage to Albany.
The team from the Human Nutrition Research Centre of Auvergne, in Clermont-Ferrand, France looked at the behaviour of proteins in muscle.
Phillips has been out since suffering ankle ligament damage in the Ospreys' home Heineken Cup win over Clermont Auvergne in October.
With five minutes remaining, Munster finally broke out of their own half and suddenly it was Clermont who were looking tired.
Lavea is one of three representatives from Clermont in the 22 with Paul Williams at full-back and Gavin Williams on the bench.
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