Roma have officially signed Kevin Strootman from PSV for €16.5m and sold Marquinhos to Paris Saint-Germain.
It had already been confirmed by PSG earlier this evening that the Marquinhos move had gone through.
The Giallorossi released financial details of the two transfers on Friday night.
Defender Marquinhos joins Paris Saint-Germain for €31.4m, while Roma must also pay Corinthians a proportion of the fee as part of the contract they signed in August 2012.
Strootman completed his transfer this evening for €16.5m, plus performance-related bonuses up to €3.5m over three years.
The Dutch international midfielder, who had been a transfer target for Manchester United, signed a five-year contract with Roma.