Clarkson, who boasts eight Ireland caps, has been called Down Under to "provide additional front row cover", with the Lions maintaining that this move is not due to any injury worries over the three tightheads already in the squad.

Owen Farrell made his first appearance on the British and Irish Lions' tour of Australia, playing the final 30 minutes against the AUNZ Invitational XV. The 33-year-old had not played since 4 May but showed some sharp touches on his return.