The Celtic defender has been discussing both his coach and ex-coach.
The 23-year-old was discussing his manager, who he feels is doing a 'brilliant' job in training and in general at Parkhead, and said Deila is more relaxed than Lennon was but also works the Bhoys more on the shape of the team.
Now Bolton Wanderers boss Lennon, meanwhile, would leave the Celtic squad to 'get on with it' - something else that the defender says worked well.
Matthews told reporters: "He's been brilliant and we've shown that the system of play he has brought in is very effective and we are very hard to beat.
"He's a bit more tactical and works more on shape than we were used to under Lenny. Most of the time he used to just let us get on with it - and that worked for us as well.
"Ronnie's a bit more laid back. Sometimes you need to be shouted at, and he has done that at times this season, but he's been brilliant."
Lennon has since enjoyed a good debut campaign as Bolton boss but has also come up against the rigours of Championship football. In the end, his Trotters side finished just 18th in the table - only 10 points above the relegation zone.
It will be interesting to see how the former Celtic boss can do at the Reebok Stadium after a full pre-season on his hands, however, just as it will be most intriguing to see how Deila will get on during his second campaign at Parkhead.
Will it be better, worse or the same for the Norwegian...?