The retired 38-year-old German was following Ferrari's progress at a pre-season testing in Barcelona.
The 1998 and 1999 F1 champion was the slowest man on the track in his first test for McLaren in more than five years.
Narain Karthikeyan finished 15th in the Saturday qualifying at the Spanish Grand Prix
The Williams Formula One team will present their 2005 driver lineup in Bahrain on January 7, the team said on Monday.
The 21-year-old Alonso has a star quality like no other Spaniard in Formula One since the 1950s.
Jordan's Indian ace, who was 15th in first qualifying, timed 1 minute 20.711 seconds, a fraction faster than teammate Tiago Monteiro.
'Let's hope that my good results at the Barcelona track will bring me luck this weekend,' said Jordan's Indian driver.
The 20-year-old, who had a strong first test with the team in Spain last week, had been recalled for 'further evaluation.'
Jordan's Indian ace's best lap time at Barcelona's Circuit de Catalunya was only 2.5 seconds off the pace of world champion Michael Schumacher.
Villeneuve, 33, has signed a two-year deal with the Swiss-based team.
Snow hit the third day of Formula One's pre-season testing on Wednesday, with no cars on track for the first two hours while the medical helicopter remained grounded in near-freezing temperatures.
Ferrari's Michael Schumacher has won the Spanish Grand Prix to equal the best start to a Formula One season with five wins in a row.
The world champion was 1.4 seconds faster than Jenson Button in Friday's practice for the Spanish Grand Prix.
Rosberg and triple world champion Lewis Hamilton shared testing duties on Tuesday, with the Briton taking over in the afternoon for a race simulation. Together, they did 169 laps without a hitch
Triple Formula One world champion Lewis Hamilton hailed his 'fantastic' Mercedes after wrapping up the first pre-season test with another 99 laps before lunchtime on Thursday.
Lewis Hamilton is now just three wins short of Ferrari great Michael Schumacher's all-time record 91.
McLaren stepped up their preparations for the new Formula One season with the track debut of their new MP4-21 car.
World champion Michael Schumacher was only 15th fastest in free practice for the Spanish Grand Prix.\n\n
Frank Williams said the FW25 is a completely new race car, shorter than lasy year's.
Ferrari will be looking for answers in Formula One testing this week after champions Mercedes were more dominant than ever in Sunday's Spanish Grand Prix.
A prototype 'halo' head protection device made its Formula One test debut in Spain on Thursday, with Kimi Raikkonen declaring visibility to be 'okay' after lapping with it attached to the cockpit of his Ferrari.
The win also set a record, one that Hamilton had previously shared with seven times champion Michael Schumacher, of 41 wins from pole position.
Ferrari made a strong start to the first day of Formula One testing, on Monday, with four-times world champion Sebastian Vettel top of the timesheets at lunchtime with 72 laps completed.
McLaren's Fernando Alonso was involved in a heavy crash on the final day of pre-season testing in Barcelona on Sunday but is "ok and conscious", officials said.
Media reports this week suggested that British energy drink firm Rich Energy was leading a consortium seeking to purchase the Silverstone-based team for 200 million pounds ($278.66 million).
In the interests of better visibility, teams were told last month they could fix mirrors to the halo head protection device that encircles the cockpit and that became mandatory this season.
The Ferrari driver's best time of one minute 16.231 seconds was close to the 2018 Spanish Grand Prix pole time by Lewis Hamilton for Mercedes.
The Finn's lap of one minute 17.221 seconds around Barcelona's Circuit de Catalunya was the second fastest of the eight days of winter testing and slower only than team mate Sebastian Vettel's best on Thursday.
The Mercedes driver's 55th career win was hard-fought and tense, however, with Ferrari's Vettel seizing the lead at the start and in the hunt all the way to the finish as the tyre strategies played out.
Seven-times world champion Lewis Hamilton became the first Formula One driver to take 100 pole positions after lapping fastest for Mercedes in Spanish Grand Prix qualifying on Saturday.
Formula One is changing its scoring system to award a point to the driver who sets the fastest race lap, starting from this weekend's season-opening Australian Grand Prix in Melbourne.
Daniel Ricciardo showed Red Bull's pace on Wednesday by lapping Barcelona's Formula One circuit faster than anyone since the track was reconfigured in 2007.
Embattled Force India co-owner Vijay Mallya will not be attending Sunday's Spanish Grand Prix but he is hoping for a change of fortune on the track at least for his Formula One team in Barcelona.
Fernando Alonso believes his McLaren team could have the best chassis in Formula One before long this year but the Spaniard also sees no end to champions Mercedes' domination after pounding out the laps in testing.
Mercedes brought intrigue to Formula One testing on Thursday with television images showing Lewis Hamilton moving his car's steering wheel forwards and backwards as he drove. The mechanism appeared to alter the alignment of the front wheels, with the six-times world champion pulling the wheel towards him on the straights and pushing it back as he approached corners.
Lewis Hamilton did 94 laps of Barcelona's Circuit de Catalunya on the soft C2 compound in a sunny afternoon session
The sport's oldest and most successful team are hoping the car, with more red and less white in the livery following the departure of sponsor Santander, will take them to a first championship in a decade.
The past week saw a lot of brilliance in sports. It started with Juventus and Barcelona lighting up the Champions League with their inspiring football and, later in the week, Mercedes' Nico Rosberg stoked the F1 circuit in Spain, capping a brilliant win to cut teammate Lewis Hamilton's lead to 20 points. Rediff.com has this, and many more memorable moments snapped right here.