There a few more devastating counter-attacking full-backs in Europe than the 20-year-old from Melrose. As he showed during the Six Nations, Hogg has a lethal turn of foot and is always keen to use it. The Ospreys may opt to test him under the high ball, but kicking down his throat is risky. It may be better to try to stretch him by kicking to the corners.
The New Zealander had few chances to show his quality in the first hour against the Scarlets last week, but he is a top-drawer player who will hurt the Ospreys if given space. Warren Gatland is likely to be keeping an eye on the former Super 15 man after Maitland made his Test bow for Scotland in the Six Nations. Formerly of the Crusaders, he offers Glasgow a genuine cutting edge.
One of the success stories of the season at Glasgow, the Fijian can play at scrum-half and on the wing and will need to be policed carefully because he can hurt sides with his pace and power. Has scored six tries in his last eight league outings and is constantly looking for opportunities to probe. Alert defence will be essential with him around.
Glasgow's second-row totem, Kellock is a warhorse who boasts 52 caps for Scotland and a passion for playing for the Warriors. At 6ft 8in and 18st 10lb, he has huge presence at the heart of the Glasgow pack and rarely goes missing in action. Every side needs a Kellock, a player who will stand his ground and give everything for the team. He will be battling long after others have tired.
Leaving Glasgow this summer, Barclay will be missed as he is one of the best opensides in the Pro12, a player with awareness, speed and courage. He showed his worth by achieving several turnovers against the Scarlets last week. After conceding too much possession at the breakdown against Treviso, the Ospreys will need to match the challenge Barclay is sure to throw down.
