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Radamel Falcao has revealed he feared his move to Manchester United would collapse at the last minute.

United pulled off a stunning coup to land the Colombia striker on transfer deadline day, but the deal to sign him on a season-long loan from Monaco went right to the wire.

Despite agreeing a loan fee of £6million with Monaco, United did not announce Falcao's signing until 1.30am Tuesday – two-and-a-half hours after the deadline.

Falcao, on international duty with Colombia for last night's game against Brazil in Miami, revealed the stress he felt as the clock ticked away, putting his move in doubt.

"No one has the idea of the stress I experienced at the time," said Falcao. "The transfer almost wasn't achieved but thank God we had an additional hour and then it occurred."

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Falcao underwent a medical at United's Aon Training Complex and was in Manchester for less than 24 hours before flying out to Miami to join up with the Colombia squad.

With United boss Louis van Gaal back in his native Holland on Monday, Falcao was met by assistant boss Ryan Giggs and the 28-year-old said he was impressed with what he saw.

"The first impressions that I took made a great impact on me,” said Falcao. “Manchester United is a great institution that lacks nothing and I'm happy to have taken this step."

Falcao missed the World Cup through injury after suffering crucial ligament damage in January and underwent knee surgery, but he has made his long-awaited comeback with Colombia.

"I'm very happy and excited to return to the team," said Falcao. "The hard times have made me grow as a human being and today

“I appreciate very much my life in football. I am very confident, I have scored goals again [for Monaco], and now I just want to play."

Falcao is in line to make his debut for United in their Premier League encounter with QPR at Old Trafford a week on Sunday.

Arrival - Radamel Falcao signs: