The defender’s form for the Toffees, since his 2007 move from Sheffield United, has earned him a regular place in the England squad.
His existing deal wasn’t due to expire until 2014 but the club were keen to reward the 28-year-old with an improved agreement to ward off interest from potential suitors including Arsenal.
“I’m really pleased,” Jagielka said. “We had talks a while ago and I knew it would only be a case of getting it signed and sealed and you can tell by the smile on my face that I am absolutely delighted to commit my future to Everton.
“I had a little while left on my last one but it is obviously nice to get a new one.
“I can concentrate on the football and hopefully there are exciting times ahead for me and the club.”
Javi Gracia said it was always going to be an uphill battle for Watford after conceding so early against Liverpool on Saturday.
Schalke 04 boss Dominico Tedesco paid tribute to goalkeeper Ralf Fahrmann after his 76th-minute penalty save proved crucial in a 1-0 win over Wolfsburg.
Mattia De Sciglio stunned that Juventus were shocked to be held to a goalless draw with SPAL on Saturday.
Sunderland have suspended midfielder Darron Gibson with immediate effect after he was charged with drink driving.
Jose Mourinho's recent bad frame of mind was still present despite Manchester United beating Brighton 2-0 at Old Trafford on Saturday, a result that puts them into the last four of the FA Cup.
Mohamed Salah continued his astounding goalscoring form on Saturday, hitting four goals as Liverpool thrashed Watford 5-0 at Anfield.