Middlesbrough head coach Aitor Karanka says his approach to selecting winger Adama Traore is justified.
Fans have taken to the winger, 20, who has made nine appearances following his move from Aston Villa in August.
However, only five have been starts and he played just nine minutes as a sub against Southampton on Sunday.
"With him on the pitch, after 20 seconds Southampton had a chance," Karanka told BBC Tees. "That's the sort of thing that people don't see."
Karanka added: "I have to check every single thing, I know he had an impact, but Adama's game can't be a highlight of 40 seconds, it's got to be 90 minutes.