Middlesbrough boss Gareth Southgate admits Julio Arca could be a future club captain.
The 26-year-old would now appear to be in pole position if to replace Boateng on a full-time basis if he did leave the club.
Southgate said: "I chose Julio at Portsmouth and the team did well there. I didn't have too many options to freshen things up (against Everton) so I kept with most of that team.
"He's certainly an excellent professional, it's important that he has everybody's respect and he did a very good job in those two games."