The Brazilian today put pen-to-paper on his new deal having agreed to prolong his stay at St Mary's.
Guly arrived at the Club in the summer of 2010, initially joining on loan from Italian side Cesena before making his move permanent the following January.
Since moving to England, the 30-year-old has played for Saints 85 times, scoring 22 goals during that time.
Guly told saintsfc.co.uk
: "I'm very happy to have signed a new contract.
"To be able to stay here for another year to help the team was very important for me, and I think I have a big opportunity this season.
"I'm happy and my family are happy to stay here, so it was good to sign a new contract.
"It has been going good in England for me since I've started to speak English too! Things couldn't be any better for me.
"Everything has gone well in the last two years - the team has come back into the Premier League and we have a good chance to do well this season.
"We are going to play in big stadiums against big players, and the fans are going to be happy to see these teams in Southampton again.
"It's going to be fantastic because I have a big chance to show people what I can do. "
First Team Manager Nigel Adkins said: "I'm delighted that Guly is staying at the Club.
"He has been a vital part of what we have achieved during the past two seasons, so we were keen to keep him here.
"He is tall, powerful and is extremely versatile having played in a variety of positions for us during his time at the Club.
"He has adapted well to the English game and has scored some crucial goals over the past two years to take us to where we are today.
"Guly will be an important member of our team in the Barclays Premier League, so I'm very pleased that he has extended his contract."