Trossard will provide much-needed attacking reinforcements for Arsenal as they find themselves in the midst of a Premier League title race, seeking to hold off Manchester City and possibly their city rivals United as well.
The Seagulls confirmed the deal in a statement, saying: “Leandro Trossard has completed a permanent move to Arsenal, for undisclosed terms. The winger departs having made 121 appearances, with 25 goals and 14 assists during his time with Albion.
Brighton head coach De Zerbi said: “I’m sorry for the last period, but I still would like to wish Leandro good luck for the future.”
Trossard’s Brighton contract was due to run out in the summer, albeit with an option to extend, which is why his price is relatively low for a recently turned 28-year-old with proven Premier League experience.
The south-coast club had been looking for £30m, with 10% of any fee to go to Genk, but settled for a shade less than that amount to complete the deal.
Representatives of the 24-cap Belgium international - who featured in all three Belgium fixtures in the World Cup in Qatar - had been pushing for a deal all window and, while there was interest from a series of clubs, Arsenal represented by far the best option. The player was keen on a move and there is a good working relationship between the clubs from previous transfers such as Ben White.
Trossard had been in fine form this season with seven goals in 16 games, before a breakdown in his relationship with De Zerbi.
“Recently, he didn’t give 100 per cent in training and on matchday, that’s it on my side,” the Brighton manager said when explaining why Trossard was being frozen out.
“Football deserves respect. I don’t have to apologise for anything. Maybe his agent fancies selling him for a lower transfer fee… surely, Trossard didn’t tell me the truth.”
Now he will be thrust into the midst of a title challenge at the Emirates Stadium as Arsenal look to lift the Premier League trophy for the first time in almost 20 years.