Marseille are on a winning run as they prepare to visit Albion.
But they angered their coach in their last 45 minutes before the trip to Sussex.
OM were 4-2 winners at lowly Lorient in Ligue Un last night.
They led 4-1 at the break but eased off in a second half which saw right-back Jonathan Clauss sent off for a reckless thigh-high tackle.
Pierre-Emerick Aubameyang scored twice and has contributed seven goals to those four wins.
Marseille boss Gennaro Gattuso did not sound unlike his compatriot Roberto De Zerbi as he delivered his verdict at Lorient.
He said: “I am very happy with the win but very annoyed by the way the match went.
“We played like a great team in the first half, but the second half took me back to the game at Strasbourg (a recent 1-1 draw).
“I am very angry about the second half.
“It’s a question of mentality, of state of spirit.
“I was already unhappy about the goal we conceded at 3-0.
“I can talk about that because I’ve lost a Champions League final after leading 3-0 at half time (with Milan against Liverpool in 2005).
“I’ve congratulated the boys on the win but I’m very angry.”
Gattuso was asked about Aubameyang’s “incredible form” as the question was phrased.
He replied: “His form is incredible for you, not for me.
“I’ve seen him every day. He grafts enormously and he gets the fruits of his work.
“He gives a lot and is very much appreciated by his team-mates.
“In my career I’ve come across a lot of players and I can say he is a true pro - serious, dedicated, always with a great mentality.”
Marseille have been playing in a 3-5-2 or 3-4-1-2 formation with Aubameyang partnered by Portugal under-21 international Vitinha on attack.
Aubameyang's double at Lorient included a majestic header from a cross delivered under no pressure by Chancel Mbemba.
Mbemba himself and fellow defender Leonardo Balerdi also scored.
OM are again without midfield powerhouse Geoffrey Kondogbia, who missed the 2-2 draw with the Seagulls at Stade Velodrome.
Fellow midfielder Valentin Rongier is also on the injured list.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here