"I can't wait to get started and train with the boys. I'm glad it's completed and I can focus on what's ahead now," the Democratic Republic of Congo native told Middlesbrough's website. (www.mfc.co.uk)
"I can't wait to meet the manager and get ready for next season. There's a good feeling around the place. From the minute I walked in it felt right."
Assombalonga is new manager Garry Monk's fifth signing of the transfer window as the club look to seal an immediate return to the Premier League after being relegated last season.
Middlesbrough's previous record signing was Brazilian striker Afonso Alves, who joined from Dutch side Heerenveen for around 12 million pounds in 2008, according to British media reports.
(Reporting by Aditi Prakash in Bengaluru; Editing by Peter Rutherford)
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