The Metropolitan Police confirmed that a 31-year-old was taken to a station in west London on suspicion of actual bodily harm.
The laser pen was shone from within the section holding the away fans, and was seen being aimed at Chelsea manager Jose Mourinho, as well as home players Oscar and Eden Hazard.
Mourinho said after the match: "I was aware of it but I cannot be worried about that when the game is going on.
"I don't know if it creates any kind of problem, and during the game I felt it a couple of times, but not big.
"I felt the green laser, but I felt no pain, so I kept going."