Nathan Jones has urged Albion to concentrate all their efforts on a more realistic route to Wembley in the Championship.
The Seagulls are out of the FA Cup following Monday’s fifth round replay defeat at Hull.
They go to fourth-bottom Millwall on Saturday still within four points of the play-offs with a game in hand of Reading in sixth.
The play-off final is staged at Wembley at the end of May and assistant head coach Jones said: “Ultimately our main aim this year is to get promoted.
“The FA Cup was a fantastic side issue, one we really enjoyed and wanted to do well in.
“But now the cliche is to concentrate on the league but that’s exactly what we have to do.
“We have a really busy schedule, with seven games in each of the next two months, that will ultimately show what this season is about.”
Jones wants Albion to build on their much-improved second half performance in the 2-1 defeat at Hull.
He said: “If we take the second half display and add that to what we have been doing so far in the League to the next few games then we’ll be fine but we have to make sure that we are right at it and don’t take our foot off the pedal in any way.”
Albion’s FA Cup exit means Reading’s key visit to the Amex goes ahead as scheduled on Saturday March 8.