Already-relegated West Brom went to Leeds on the final day of the Premier League season and lost 3-1.
And at full-time, the Baggies assistant asked the Leeds boss for his coat in one of the more unique requests this campaign.
Lee and Bielsa exchanged words on the touchline before appearing to agree to the swap in the tunnel.
¿Cambio de camisetas entre jugadores? Un millón.- Javier Lanza (@javierlanza) May 23, 2021
¿Cambio de camperas? La primera que veo.
Sammy Leé, ayudante de Sam Allardyce en el West Bromwich Albion, le pidió cambiar la campera a Marcelo Bielsa.
Una rareza en la #PremierLeague pic.twitter.com/FKgayaDHAD
Fans online loved Bielsa's interaction with Sam Allardyce's No.2.
Love the fact Bielsa swapped jackets with Sammy Lee :joy::joy:- James Høwsøn (@BigJimmy_V) May 23, 2021
Love that Bielsa who apparently "can't speak English" was there casually chatting away to Sammy Lee, the most English man you can get. You lot don't get it do you :joy:- Wayne (@wayneleedsfan) May 23, 2021
Sammy Lee swapping jackets with Bielsa love that #LEEWBA- BARNEY :copyright: (@BarneyLUFC21) May 23, 2021
Sammy lee and WBA have just been relegated and his first thought is:- LUFC Bantersaurus Rex :trophy: (@lufcbrex) May 23, 2021
"I need Bielsa's jacket."
got to love it. #lufc
Sammy Lee just asked Bielsa to swap jackets :joy::joy: doing it in tunnel that's incredible :joy: #lufc- Matt James (@Matt1Lufc) May 23, 2021
Bielsa's all-action side finished the campaign in the top half, securing an impressive ninth-place - ahead of the likes of Everton, Aston Villa and Wolves.
And speaking on his team's achievement, he said: "It's difficult to offer a conclusion because on one side I am very satisfied with what the team achieved but on the other side I feel like we could have added a few more points.
"If we divided the competition in two, in the second part of the season we received 50% less of the goals that we did in the first part.
"Had we had that security defensively the whole campaign we could have added those points I would have liked this season.
"Anyway, I am satisfied with what we achieved, it is very difficult to win a game in the Premier League, very difficult.
"On the other side like I said, I feel like we could have had a few more points."
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