Ronan Kelleher (Leinster Rugby, Ireland) will join-up with The British & Irish Lions touring party on Thursday 15 July.
The Irish hooker, who trained with the Lions squad in Jersey prior to the start of the Castle Lager Lions Series, will travel together with Alun Wyn Jones (Ospreys, Wales) to Cape Town.
"I’m delighted to announce Ronan will join up with the squad," said Lions Head Coach, Warren Gatland.
"There’s no injuries to the three hookers out here, but we think it’s prudent to bring in cover in that position ahead of the Test series."