But while turning out 15 times for the club in total, it was announced the 29-year-old was leaving the club by mutual agreement this summer, and a return to Treviso promptly arrived.
In his absence the Italian side failed to improve on their 11th place position from 2013/2014, finishing in the same spot in the table, but with two fewer victories and 11 less points.
But after reacquainting himself with old friends and teammates, de Marchi - who was left out of Italy's final World Cup squad - believes the team can make up ground this time around.
"I wanted to get back to Treviso because that's home for me. A year away from the club makes a difference but I am finding my feet again very quickly," he said.
"There have been many changes while I have been away but good changes.
"I wasn't playing there last season but I followed my teammates. The team was put together in a very short time last year so their preparation work was not as good as it should have been.
"This year is completely different. I can feel it is a very positive environment. There is a lot of enthusiasm there so I'm sure we will do a lot better than last year."
Follow us on Facebook, join the conversation on Twitter, sign up to our YouTube channel for extensive match highlights and sign up for our newsletter for regular updates on the GUINNESS PRO12
63x46.png){kind=logo}