The two clubs agreed a deal in principle and Bruno Guimaraes is set to join.
Reports suggest the fee is 40m euros (£35m) with a further 8m (£6.7m) euros in add-ons.
The two clubs are finalising details before an announcement is made after the Brazilian passed a medical while on international duty.
The third signing of the January transfer window will be the 24 year old.
The third bottom team in the premier league has brought in England full-back Trippier for 12 million and signed Chris Wood for 25 million.
Eddie Howe didn't think that would be the end of our interest in bringing new players before deadline day on Monday.
On Saturday, the team returned from a training trip to Saudi Arabia and will face off against Everton on February 8.
The backline has only kept two clean sheets in the league this season.
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