Gannon was appointed on Monday night as replacement for Mark Cooper - who lasted just 13 games - and Lee expects to see a positive change for the Championship strugglers.
He said: "Jim has been very good. He has held a couple of meetings with the players to lay down what he expects from us and we have done two really good - and really hard - days of training.
"It always takes a little while for a new manager to settle in and for everyone to get used to his preferred style of play. Jim has spoken about the tactics and the systems he likes to use and hopefully we can put them into practice.
"There were a few differences between the way Darren Ferguson and Mark Cooper did things. They have been effective but haven't quite worked for us this season. Throughout my time at the club the team spirit has been great but that always takes a hit when you struggle or things happen. But we are still together as players and hopefully Jim coming in can be the catalyst we need.
"We have enjoyed two great years but all footballers say it is hard to forget the relegations you suffer during your career. None of us want to be in this position. We have to take things one game at a time. We can't afford to think about the future or worry about what might happen at the end of the season."
Source: PA
Source: PA