Feyenoord striker Santiago Gimenez was in attendance for Arsenal's 3-2 win over Tottenham on Sunday.
Gimenez has been linked to Spurs over the past few months, raising eyebrows at travelling to see the team play.
A Mexican, the 23-year-old frontman has been a Premier League target for several months.
Gimenez has netted 23 goals in 45 games in all competitions so far this season.
Gimenez's Instagram Stories showed him heading to a Eurostar into London due to having some time off.
He then showed pictures of the outside of the stadium and a video of Son Heung-min's penalty late in the game.