Potential targets include Real Sociedad's Xavi Alonso, Valencia defender Fabian Ayala and Francesco Totti of Roma.
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Xavi then almost doubled Barcelona's lead with a 20-yard free-kick following Vidic's foul on Messi.
Spain had moved into the ascendancy as the match wore on, with Xavi increasingly influential.
Would it work at a club that didn't have Messi, Xavi, and Iniesta to execute it?
The move comes after teammates Carles Puyol and Xavi Hernandez both signed new deals with the club.
"It's always a nice feeling to win the title and the fans really deserve this, " Xavi said.
"All of these players - Fabregas, Nasri, Messi, Xavi, Andres Iniesta - are all very intelligent, " he added.
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Barcelona players Carlos Puyol and Xavi retain their places after dropping out of the Iceland game because of injury.
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This time it was Xavi with the through-ball, a perfectly weighted pass that sent Alba streaking through on goal.
And Arsenal midfielder Fabregas scored his first goal in 27 appearances for his country after heading Xavi Hernandez's blocked volley.
It was still one-way traffic and after Iniesta was pulled down, the excellent Xavi's free-kick thumped the post with United reeling.
But cases like Xavi, who joined Barcelona at 11, rose through the ranks and became a club legend, are exceptionally rare.
However, Barca were rampant and Seydou Keita hit an unstoppable fourth before Xavi tapped in late on to wrap it up.
Last December in-form playmaker Xavi tore his cruciate ligament, but former youth team player Andres Iniesta emerged as an able replacement.
Defender Jordi Alba exchanged passes with Xavi and burst through the center of the Italian defense before easily beating Gianluigi Buffon.
Sanchez replaced Spain midfielder Xavi, who made a record 32nd Clasico appearance.
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Both riders will be present at the launch in Madrid this weekend, alongside Hilton and her partners Nano, Xavi Montero and Ricard Garriga.
When Xavi Hernandez and Andres Iniesta were substituted in the second half, it left Barcelona without its three biggest stars on the field.
Xavi played in Iniesta down the left, before finishing his team-mate's cross from inside the box with a well-timed run into the box.
The only goal came in the second half when Xavi's long-range drive took a deflection off Sammy Clingan's head to wrong-foot goalkeeper Maik Taylor.
Former Barcelona president Joan Laporta called Castel the club's greatest ever signing, while current Barca playmaker Xavi is among his legion of loyal fans.
Xavi's club teammate Andres Iniesta threaded a perfect pass through for Cesc Fabregas to cross for David Silva to head home on 14 minutes.
"We'll keep fighting, because we know that it's still in our own hands to have a good season, " Xavi said on Barcelona's official website.
The Ivory Coast midfielder stole in unmarked to nod home a lofted through-ball from influential midfielder Xavi to score his sixth goal this season.
Pedro Rodriguez hit a double with Xavi Hernandez and Lionel Messi also on target as Barca made it 17 league wins from 18 games.
Xavi was the creator with a cross that looked too high for Messi, but he expertly soared to send a header over Van der Sar.
The visitors looked set to share the points with the Catalan giants until a brilliant 87th minute strike from substitute Xavi Hernandez broke the deadlock.
Xavi Hernandez, the midfielder, misplaced half a dozen passes in the first half alone, a total he rarely eclipses in an entire month for Barcelona.
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Barcelona will be boosted for Tuesday's Champions League trip to Paris Saint-Germain by the return to fitness of key midfielder Xavi and attacking fullback Jordi Alba.
"Little details matter a lot now and psychologically, we are undergoing a Master's degree with Pep, " Barcelona midfielder Xavi said at the time, according to Hunter.
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