The Swansea-born striker was pleased to see the news this week.
He was appointed in January after the departure of Garry Monk and helped to guide the club to Premier League survival.
Still the new deal came as something of a shock, considering that Swansea were being heavily linked with a move to bring former boss Brendan Rodgers – who was sacked by Liverpool earlier this season - back to the club.
The decision to hand a new deal to Guidolin has certainly been welcomed by one Swansea fan. John Hartson was born in the South Wales city, although the Welsh international never played for the club.
The former Celtic and West Ham striker had this to say on Twitter regarding the decision to give the Italian his new deal:
Said that Guidolin has done excellent since his arrival but thought Swansea would make a change. Great decision. he deserves to stay on.— John Hartson (@JohnHartson10) May 12, 2016
Guidolin, who missed a series of games during his reign earlier in the campaign with a chest infection, will now be hoping to get through the entire 2016-17 season with The Swans and lead them to a much higher and more comfortable Premier League position.