"We are delighted that he has signed a new contract. He represents the future of the club," said manager Alex Ferguson.
The US-born forward Rossi is the second young player to arrive at Old Trafford this month after 17-year-old Spanish defender Gerard Pique joined from Barcelona.
Giuseppe Rossi kept Europa League semi-finalists Villarreal on course for a place in the Champions League next season with a penalty to secure a 1-0 win over relegation-threatened Real Zaragoza in La Liga on Monday.
Giuseppe Rossi continued his remarkable comeback with a 15-minute hat-trick as Fiorentina recovered from two goals down to defeat previously unbeaten title-holders Juventus 4-2 in Serie A on Sunday.
Thousands of mourners gathered in the Italian city of Vicenza on Saturday for the funeral of former Italy forward Paolo Rossi, whose coffin was carried to the cathedral by his team mates from the 1982 World Cup-winning side.
Coaches finally put World Cup hopefuls out of their misery on Tuesday when they named their final squads for the tournament, shattering some dreams while also handing out the opportunity of a lifetime.
Bayern Munich cantered into the Champions League group stages after a 1-0 victory at FC Zurich on Tuesday while two goals from Giuseppe Rossi rescued Villarreal against Odense.
Villarreal romped to a 5-0 home victory over promoted Tenerife on Sunday, continuing their revival after a poor start to the La Liga campaign.
Real Madrid's La Liga title hopes suffered a huge blow with a surprise 1-0 defeat at Osasuna on Sunday which left Jose Mourinho's side seven points adrift of leaders Barcelona.
Brazil advanced to the semi-finals of the football competition with a 2-0 win over Camerron after extra time.
Manchester United crushed minor league Burton Albion 5-0 in their FA Cup third-round replay
Brazilian winger Anderson wants to help Fiorentina qualify for next season's Champions League after he completed his loan move from Manchester United.
Esteban Cambiasso inspired a stirring fightback as Inter Milan struck twice in the last 18 minutes to record a 2-1 victory on Thursday and hand Fiorentina their first Serie A defeat of the season.
The papal conclave, the process to elect a new Pope, is set to begin on Wednesday, May 7, 2025, following Pope Francis' death. The event takes place within the Sistine Chapel in Vatican City and involves the College of Cardinals.
Fiorentina conceded a late goal, had David Pizarro sent off and lost their 100 percent Serie A record in a 1-1 draw at home to Cagliari on Sunday, with an injury to Mario Gomez compounding their frustration.
Cristiano Ronaldo netted a first-half penalty as injury-depleted Real Madrid recovered from their derby defeat by Atletico Madrid at the weekend with a 3-1 win at Levante on Wednesday.
Italy and Nigeria played out a thrilling 2-2 draw which included a goal-of-the-season contender from Shola Ameobi in an entertaining friendly at Fulham's Craven Cottage on Monday.
Gonzalo Higuain netted twice, the first a superb individual effort, to give Napoli a 4-2 win at Lazio while Fiorentina beat Hellas Verona 4-3 in a Serie A scoring spree on Monday.
Brazil playmaker Kaka scored his first goal, a delightful curling shot, since his return to AC Milan at the start of the season but his struggling team were held 1-1 at home by Lazio in Serie A on Wednesday.
After a tense encounter finished 1-1 following extra time, Villareal's Rulli stepped up after every on-field player scored their spot kicks and he comfortably beat Spaniard De Gea
Manchester City went top of the Premier League after securing a controversial 2-0 win at Newcastle United on Sunday with an early Edin Dzeko goal and a stoppage time effort from Alvaro Negredo.
AS Roma ended a five-match winless run against arch-rivals Lazio with a 2-0 win on Sunday which maintained their 100 percent record after four games in Serie A.
Carlos Tevez scored two early goals for Juventus before the Serie A leaders squandered the lead in a 2-2 draw at Verona on Sunday.
Juventus will end 2013 five points clear at the top of Serie A after a 4-1 victory at Atalanta stretched their winning league run to nine games on Sunday.
Playmaker Kaka breathed new life into struggling AC Milan by scoring twice and 18-year-old Bryan Cristante claimed his first professional goal as they beat Atalanta 3-0 on Monday for only their fifth league win of the season.
Stephan El Shaarawy took a small step towards refuelling his career at Monaco when the AC Milan loanee came off the bench to rescue a late 1-1 draw against Tottenham Hotspur in the Europa League's second round of group matches on Thursday.
Napoli kept their hopes of a first Serie A title since 1990 alive with an epic 4-2 win over 10-man Inter Milan after a Carlos Tevez hat-trick had put leaders Juventus six points clear with a 4-0 rout of Sassuolo on Sunday.
Juergen Klopp got a taste of the problems at Liverpool as his first home game as manager ended in a frustrating 1-1 draw against Rubin Kazan who played more than 50 minutes with 10 men in the Europa League on Thursday.
Barcelona closed in on the La Liga title by thrashing local rivals Espanyol 5-0 on Sunday as Atletico Madrid dropped out of the race after losing 2-1 at Levante and Real Madrid beat Valencia 3-2.
AS Roma coach Rudi Garcia succeeded where his three predecessors failed by taking his team to a 2-0 win over arch-rivals Lazio on Sunday and maintaining their 100 percent record in Serie A alongside Napoli who won 2-1 at AC Milan.
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AS Roma moved clear at the top of Serie A after beating Sampdoria 2-0 on Wednesday as struggling AC Milan came back from 3-1 down to draw 3-3 in stoppage time at Bologna.
US Open champions Marin Cilic and Serena Williams kicked off their China Open campaigns with straight sets victories against battling underdogs on Monday, but Rafael Nadal suffered defeat in a rare doubles outing on his return from injury.
The goal machines of Bayern Munich, Chelsea and Shakhtar Donetsk cranked into top gear on Tuesday as the Champions League captivated its continental audience with a record 40 goals in one eight-game night.
Atletico Madrid got their La Liga campaign up and running in less than convincing fashion when Antoine Griezmann's deflected free kick secured an edgy 1-0 win at home to promoted Las Palmas on Saturday.
