Everton winger Seamus Coleman has hailed the impact of manager Roberto Martinez this season.
The defender believes the Catalan has proved he has immaculate timing with a series of game-changing alterations from the dug-out so far this season.
Coleman told the Liverpool Echo: "You can see with the manager's substitutions he has good timing.
"Bringing Pienaar on to score with his first touch against Hull was good, then Ossie changed the game for us at Villa.
"He's been making spot-on decisions and it's worked for us."
