The 31-year-old frontman opened the scoring at Southampton and provided the pass from which Romelu Lukaku doubled the Baggies' advantage.
However, Fortune saw his game come to a premature end after angrily confronting Gaston Ramirez for an elbow on Shane Long.
The Saints man also saw red and West Brom went on to win 3-0 thanks to a late Long strike but Fortune was downbeat after the game, apologising for reacting as he did.
"We won 3-0 and I scored and got an assist so it was a good game for me and for West Brom, but afterwards I know everyone will talk about my red card," he said.
"First of all I want to apologise because I don't usually do that. People know I'm not a bad guy so I am really frustrated but I just reacted to what the Southampton guy did."
- Romelu Lukaku
- Gaston Ramirez