Matthews, the first pick of the 2016 NHL Draft, had not yet played an NHL game when he played at the World Cup.
"What was interesting about him was that he started as the extra forward, in our opinion," McLellan said. "Nobody really knew him. But by the time we were into the tournament, he was playing with (Mark) Scheifele and McDavid on the top line. So that tells you a lot about how quickly he can have an impact on a coaching staff or a group of young players. Both have that spirit. Both want to be the best. They make other players better."
McDavid, the Hart Trophy and Art Ross Trophy winner last season, has 30 points (10 goals, 20 assists) and has played an average of 21:37 per game for the Oilers (10-13-2) this season.
In the previous two games against the Maple Leafs and Matthews, McDavid had a goal and an assist.
Toronto won the two games against the Oilers last season, 3-2 in overtime at Toronto on Nov. 1, 2016, and 4-2 at Edmonton on Nov. 29, 2016. Matthews had a goal in the second game.