Dragons RFC will face Glasgow Warriors away in the last 16 of the EPCR Challenge Cup after the conclusion of the pool stages.
A narrow 30-25 defeat to Emirates Lions in the Round 4 encounter secured two points which ensured qualification for the knockout stages.
After waiting on the result of the final pool game - that would determine if they would face Toulon or Glasgow - it was confirmed that Dragons had finished fifth in Pool B and had the Warriors.
The Men of Gwent will now travel to Scotstoun Stadium on the weekend of March 31/ April 1 or 2.
“Glasgow will be just as tough as Toulon would have been. We play them on Saturday and have been doing a bit of preparation on them and they play at high speed with a high ball in play time,” said Flanagan.
“They are high tempo on their [artificial] track and we saw against the Lions that if you can control the speed of ball then you can express yourself.”