"I know about it since yesterday. I'm here to be in the toughest competitions, that's why I'm at Chelsea," Tuchel told a news conference ahead of Tuesday's Premier League encounter with Brighton & Hove Albion.
"I was clearly not involved and my players were not involved in the decision-making process. My role is to be coach, to be focused and we have an important game coming up tomorrow."
Abraham, 23, is Chelsea's top scorer this season with 12 goals in all competitions, but has found himself marginalised since the arrival of German coach Tuchel in January.
"I cannot make a decision on the personal goals of players," Tuchel told a news conference ahead of Saturday's Premier League game at Crystal Palace.
West Brom, second-bottom of the table, moved seven points from the safety zone while Chelsea stayed fourth but could be overtaken by West Ham United and Tottenham Hotspur this weekend.
"There's no need to concede five goals when you have our quality," Tuchel told BBC Sport after Chelsea's worst home defeat in nearly 10 years.
