Barcelona stars have been hard at work in training as they prepare for the first leg of their Spanish Super Cup tie at home against Real Madrid.
Modric will be free to return for the second leg at the Santiago Bernabeu on Wednesday.
The 25-year-old actually signed the deal in July, before heading to the United States for Real's pre-season tour, but it was agreed not to make the extension public until this month.
Whereas Madrid won the league by three points last season, the prediction for this season is that Los Blancos will pip bitter rivals Barcelona to the title despite finishing level on points.
Isco took the opportunity with both hands to establish himself in the line-up during the title run-in, even making the starting line-up ahead of Bale himself in the Champions League final victory over Juventus.
Barcelona played its first match without Neymar on Monday in a friendly against Brazilian side Chapecoense.
It was not too long ago that Isco was considered a luxury player at Real Madrid.
After all, club record signing Mohamed Salah completed a move from Roma this summer and can play there, as can Sadio Mane - who made the PFA team of the year in 2016/17 after a superb debut season at Anfield. The comeback was on for Atletico after Saul Niguez and Antoine Griezmann had cut the aggregate score to 3-2 inside 16 minutes, but Isco killed the last-four tie with a fine goal three minutes before the break.
Meanwhile، Barcelona mainstay Andres Iniesta was absent after he was given permission to miss training by former Athletic Bilbao manager Valverde.
"United are very good, but we were the best team and we have a spectacular squad with a promising future".
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