The two shows could face a showdown this autumn if BBC and ITV decide to challenge one another.
Longtime viewers will recall that the original aired on ITV, now the home to period drama rival Downton Abbey.
A spokesperson for British broadcaster ITV said Clooney would appear in a sketch, but would not act in a full Christmas episode.
Spice Girl Melanie C was a judge in the ITV Superstar contest.
As Jay walked out, according an ITV News editor tweeting from the scene, the counsel mouthed to a colleague, “This is such fun.”
When it launches in late spring, however, the ITV, as it will be called, will be a major hit.
In the U.K., where Broadchurch originally aired on ITV in the spring, the show was a phenomenon.