Unlikely, since the G20 isn't strictly the 20 largest economies. It's spread out a little more to get in some influential economies that aren't quite as large in raw GDP terms. Fellow Europeans Spain and the Netherlands are both in the top 20 and larger than Poland, but not in the G20 (although Spain has a permanent guest invite). On the other side of that, Argentina and South Africa are members, presumably because they're very influential in their regions despite not technically being in the top 20. The EU is a member, though, so Poland is sort of indirectly represented.