Cristiano Ronaldo

Cristiano Ronaldo completed his return to Manchester United on Tuesday after 12 years, saying the club always had "a special place in my heart."

United announced on Friday that it struck an agreement with Juventus to sign the five-time Ballon D’or winner and he has completed his medical examination and signed the two-year contract, with the option to extend for a further year.

A fee of 15 million euros ($17.75 million) will be paid to Juventus over five years. That could be increased by 8 million euros ($9.5 million) depending on "specific performance objectives" the 36-year-old forward achieves.

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"Manchester United is a club that has always had a special place in my heart, and I have been overwhelmed by all the messages I have received since the announcement on Friday," Ronaldo said.

"I cannot wait to play at Old Trafford in front of a full stadium and see all the fans again. I’m looking forward to joining up with the team after the international games, and I hope we have a very successful season ahead.”

A title winner with Real Madrid and Juventus, Ronaldo won the English Premier League three times with United but the club hasn't won the title since 2013.

"He is not only a marvellous player, but also a great human being,” manager Ole Gunnar Solskjaer said. "To have the desire and the ability to play at the top level for such a long period requires a very special person.

"I have no doubt that he will continue to impress us all and his experience will be so vital for the younger players in the squad. Ronaldo’s return demonstrates the unique appeal of this club and I am absolutely delighted he is coming home to where it all started.”

Transfer deadline day saw West Ham sign Croatia attacking midfielder Nikola Vlasic on a five-year deal from CSKA Moscow, according to The Associated Press.

Also, Liverpool captain Jordan Henderson signed a contract extension through 2025. The 31-year-old midfielder has 394 appearances since joining from Sunderland in 2011, scoring 30 goals and winning the Premier League, Champions League and Club World Cup.