The 20-year-old, who was this week named in England's 30-man squad for next weekend's international against the All Blacks, returns to the starting line-up following a torn shoulder muscle picked up against the Ospreys in the EDF Energy Cup last month.
Morgan's inclusion means Iain Balshaw switches to the wing in place of Mark Foster, who misses out because of a foot injury sustained during his try-scoring performance in last weekend's 37-20 defeat against Leinster.
"It is great to have Olly back in the squad because he is a fantastic young player and it gives us plenty of attacking options," head coach Dean Ryan told www.gloucesterrugby.co.uk.
"I thought our young backs did extremely well last weekend against Leinster and tomorrow we need to take the lessons learnt from that game into another extremely physical environment against Agen."
Ryan's major selection issues have occurred up front where both openside flanker Andy Hazell and number eight James Forrester are missing.
The pair sustained their injuries last weekend - Hazell has not recovered from a shoulder injury and Forrester picked up a knock to his left knee.
"Andy is still getting spasms in his shoulder and that is enough to keep him out," Ryan said. "James has a knee injury which we expect to know the extent of next week when he sees a specialist on Monday."
It means Jake Boer replaces Hazell in the number seven shirt and Luke Narraway gets a run at number eight.
There is one other change in the pack and that comes at lock. Jonathan Pendlebury will make his first start of the season alongside skipper Marco Bortolami. The front row remains unchanged which means Christian Califano will face his former club and be joined by hooker Mefin Davies and tighthead prop Carlos Nieto.
"We obviously understand the importance of this match and it should be a fantastic occasion. To have Heineken Cup rugby back at Kingsholm is special for everyone and we know it will be a massive encounter," Ryan added.
On the bench, prop Patrice Collazo returns to the squad in place of Nick Wood and Willie Walker has recovered from a knee injury picked up against Leicester in September to replace Ludovic Mercier.
GLOUCESTER RUGBY (v Agen, tomorrow, 3pm): Olly Morgan; Iain Balshaw, Jack Adams, Anthony Allen, James Bailey, Ryan Lamb, Peter Richards; Christian Califano, Mefin Davies, Carlos Nieto, Jonathan Pendlebury, Marco Bortolami (capt), Peter Buxton, Jake Boer, Luke Narraway. Reps: Olivier Azam, Patrice Collazo, Adam Eustace, Adam Balding, Rory Lawson, Willie Walker, Rudi Keil.
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