Following Sir Alex Ferguson’s retirement in the summer of 2013, Wenger took over the mantle as the Premier League’s longest-serving boss which stretches back to 1996.
Within that time, the French boss has guided the Gunners to three Premier League triumphs, five FA Cup successes and a Champions League final in 2006.
However, it’s not just the trophies which have been so impressive but the way Wenger has reinvented himself to adapt with the changes of Premier League football and his rebuilding methods.
Van Gaal is in his first season with the Red Devils, and after being placed under pressure already following a number of inconsistent performances he only had admiration for Wenger’s work in North London.
“In my opinion what he has done is amazing. It can only be in England, I believe, where managers are so long committed with one club,” the Dutchman was quoted as saying by The Daily Mail.
“It shows how much he can mean for a club as a manager. I like that - like Sir Alex Ferguson, Arsene Wenger - I think it's fantastic that you can do that.”
Wenger, however, certainly isn’t immune from flak both within the media circle and by his own club’s supporters at the Emirates stadium.
For a number of years, his inability to identify and strengthen key areas of the team has led to frustrations and last season’s FA Cup success was the club’s first trophy in as many as nine years.
United and the Gunners’ clash at Old Trafford on Monday arguably represents the last chance of silverware for these two powerhouses this season, and it's an opportunity which shouldn’t be taken lightly.