Middlesbrough striker Massimo Maccarone is set to join Italian club Siena on a free transfer early next week, according to his agent.Limited playing time on Teesside has forced the 27-year-old to seek a return to his homeland. The former Empoli striker has scored only one goal in seven league appearances for the Premiership club this season. 'I have just returned from Middlesbrough,' Maccarone's agent Paolo Fabbri told PA Sport. 'We have undergone negotiations for the player's free transfer to Siena. 'We are awaiting the okay from the Middlesbrough chairman (Steve Gibson) for the deal to be completed and that should arrive on Monday. 'There is an agreement with Siena and Maccarone could sign a three- to four-year contract with them.' Middlesbrough paid Empoli a club record £8.15million for Maccarone in 2002.