Real Madrid goalkeeper Thibaut Courtois is reportedly in line to return for Sunday’s El Clásico, marking what would be his first appearance since March 17. The Belgian shot-stopper suffered a thigh injury in the second leg of the Champions League round of 16 against Manchester City and has been sidelined ever since. Los Blancos felt Courtois’s absence nearly every time out—they kept just one clean sheet in eight matches without him between the posts. His return is seemingly in the cards, though, and just in time for the team’s trip to the Camp Nou on Sunday. MARCA report Courtois will be Álvaro Arbeloa’s starting goalkeeper against Barcelona barring any setbacks. The 33-year-old completed Monday’s training session with the group and is on his way to sending Andriy Lunin, who received warranted criticism for his performances over the last seven weeks, to the bench. Should Courtois start El Clásico, he will make his 330th appearance for Real Madrid.…