Chicago Fire have confirmed the signing of Brazilian defender Adailton.
"Adailton is a strong, powerful defender," said Yallop.
"This is a position we were looking to fill, so I'm pleased that we will be adding a player with his experience to our team."
Adailton, who won the 2003 FIFA World Youth Championship with Brazil, added: "It is with great satisfaction that I will continue my career with the Chicago Fire and play in Major League Soccer.
"I have been watching MLS closely over the past several seasons and ever since 2004 while in France, I made it a goal of mine to play in the United States. I had other opportunities to join MLS clubs in the past but the timing was not right until this challenge with the Fire.
"I look forward to working with my new teammates and Coach Frank Yallop and his staff to take on the challenge of returning the Fire to the Playoffs and giving the Fire Supporters the trophies they deserve."
Chicago Fire (@ChicagoFire) December 30, 2014
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