Frank Hadden hopes his players can maintain his 100% record as the country's interim head coach and make it difficult for the Scottish Rugby Union not to appoint him as permanent successor to sacked Australian Matt Williams.
But Glasgow number eight JP is also laying for his future as captain, having been given the position by Hadden while Gordon Bulloch tours with the British and Irish Lions.
"I do enjoy being captain of my country," JP told the Press Association ahead of Sunday's match in Bucharest.
"When it happened, I have to admit that it was something that perhaps took me a few days to get my head around because I wasn't expecting to be told that at all. It is something that I enjoy and I feel it has added an extra something to my game.
"I just have to wait and see what happens now. I'm in the same position as Frank as I was only put in on an interim basis and I could be dropped if a new coach comes in.
"I am only in the job because of Frank and and if things go badly then we'll be for the chop, but if things go well and I am playing at the top of my game then there's no reason why I can't carry on leading my country - so winning is vital."
The 28-year-old claims his team-mates are desperate to beat the Romanians because they want Hadden to get the job full-time having restored confidence in the ranks.
JP said: "Frank has been very good for us and he brings out confidence in other players. That's been a major problem in the past few years and we never had a terrible amount of confidence in our ability, but since Frank has come in he has put that back in us.
"We now believe we are good players and have confidence in our own ability and that came out on the pitch in Aberdeen. This weekend is going to be very tough but we want to win it for Frank to give him that 100% record.
"The players do feel a weight of responsibility at the moment, considering that things haven't gone well in the past year to two years and that he want to do it for Frank.
"We also have to get the public back on our side. We can only do that by winning matches. If we can keep winning matches then the rest will take care of itself and hopefully Frank will get the job."
But JP has a cautious warning against complacency and warns that this weekend's opponents will greatly contrast to the Barbarians side they faced at Pittodrie last week.
He cautioned: "We can't get carried away with ourselves. The result against the Baa-Baas was great and our first win against them ever but it's going to be extremely tough this weekend against Romania - much more tough. Romania will represent a huge physical challenge for us and we have to be ready.
"This week has been decent but last week's result against the Baa-Baas doesn't matter now. We have to do the business again. The performance is the most important thing and we must build on that."