Glasgow have named their starting line-up to take on Ulster in the crunch Magners League match at Firhill this Friday.
John Barclay has recovered from a stomach bug to make the team for the second of three home matches in an vital April for the Warriors.
Scotland international Barclay withdrew from the starting XV during the warm-up prior to the 27-19 victory over the Dragons two weeks ago.
"John gave his absolute all against Munster where he was absolutely outstanding," said coach Sean Lineen.
"I haven't seen a performance like that from a seven in a long time. However, we need the back-row to step up as a group and the front five have a huge job to do in order to give us the platform for success."
Lineen continued with his thoughts ahead of Ulster's visit to Firhill, building up the game as being crucial to their play-off aspirations.
"Every game is a knock-out game so this Friday is massive for us," he said.
"Ulster have won on their last three visits to Firhill and they always get a good following here in Glasgow. But our support has been fantastic all season and I've no doubt that the Glasgow fans will make the most noise and really get behind the players."
Meanwhile, Ulster Head Coach Brian McLaughlin has made several changes to the side that lost at home to the Ospreys on Tuesday.
Into the line-up comes wing Nevin Spence, fly-half Ian Humphreys, scrum-half Paul Marshall, lock Ryan Caldwell, hooker Andi Kyriacou and prop duo Declan Fitzpatrick and Tom Court.
"We had a good review of Tuesday night's game against the Ospreys, and we got to look at our defence, which is still suffering from inconsistencies," said McLaughlin.
"For Andrew Trimble's try our defence was magnificent, and for Danielli's try, well that also came from a defensive turnover, so we know the key is to be more consistent.
"Our set piece on Tuesday night was a lot more solid, we just have to stop giving away soft tries. Shane Williams' try was a prime example and we gifted James Hook two tries under the posts, so we must improve in this aspect of our play.
"Glasgow are a quality side and we're expecting a very tough game. It's been a quick turnaround for us from the Ospreys. Physically we're in good shape, so now the challenge is to get the players mentally focused for this very important game"
Form: Glasgow beat Ulster 25-13 at Ravenhill in round eight, whilst Ulster have won on three of their last four visits to Glasgow. The Warriors' five game winless run came to a halt at home to the Dragons last time out. Warriors' only defeat in their last six encounters at Firhill Stadium was 7-30 to Cardiff Blues in the Magners League on 19 February. Ulster host Ospreys on Tuesday evening. The Ulstermen have won just one of their last seven away matches in all competitions: 28-10 at Bath in the European Cup on 23 January.
Glasgow: 15 Bernardo Stortoni, 14 Colin Shaw, 13 Max Evans, 12 Graeme Morrison, 11 DTH van der Merwe, 10 Dan Parks, 9 Mark McMillan, 8 Johnnie Beattie, 7 John Barclay, 6 Kelly Brown, 5 Alastair Kellock (capt), 4 Tim Barker, 3 Moray Low, 2 Fergus Thomson, 1 Kevin Tkachuk.
Ulster: 15 Simon Danielli, 14 Andrew Trimble, 13 Darren Cave, 12 Ian Whitten, 11 Nevin Spence, 10 Ian Humphreys, 9 Paul Marshall, 8 Robbie Diack, 7 Chris Henry, 6 Stephen Ferris, 5 Ryan Caldwell, 4 Ed O'Donoghue, 3 Declan Fitzpatrick, 2 Andi Kyriacou, 1 Tom Court.
Replacements: 16 Nigel Brady, 17 BJ Botha, 18 Dan Tuohy, 19 David Pollock, 20 Isaac Boss, 21 Niall O'Connor, 22 Jamie Smith.
Date: Friday, April 16
Kick-off: 19:05 BST
Referee: Tim Hayes (WRU)
Assistant Referees: Andy Macpherson, (SRU), Ronnie Duma (SRU)
TMO: Jim Yuille (SRU)