Costa and Oscar were replaced during win over Scunthorpe, while Matic missed the game.
The 62-year-old Chilean has claimed he is committed to entertaining supporters.
Van Gaal's side struggled to break down their opponents again on Saturday.
Falcao has been out since late October with a thigh muscle injury and recently suffered an additional setback in training.
Midfielder looks set to complete his move from FC Basel once a visa is obtained and paperwork is completed.
Van Gaal previously said the Belgian would feature for the U21s to get his fitness up.
Former Barca teammate backs Argentine to regain coveted award.
Former Juventus star has scored 22 goals in his first season in the MLS.
Joel Campbell spoke with IBTimes UK after an impressive performance in the 3-1 FA Cup win over Sunderland.
Newcastle United face Manchester United in the Premier League clash on Tuesday. Find out how to follow the match live in the UK.
The draw for the fourth-round of the FA Cup takes place on Monday evening.
German gaffer has told Premier League-inbound boss that squad size is paramount.
Arsene Wenger claims Sanchez could make his comeback from a hamstring injury against Stoke on 17 January.
The 49-year-old Frenchman thinks his players need to work harder during games.
Manchester United are reportedly ready to pay £90m to secure the services of Real Madrid star.
Chelsea's interim boss believes the in-demand Spaniard will succeed in English football.
Lionel Messi, Cristiano Ronaldo and Neymar compete for the tile of world footballer of the year in Zurich.
Spain centre-back was substituted at half-time as Real beat Deportivo La Coruna 5-0 at the Santiago Bernabeu.
FA Cup replay adds to an already hectic schedule for Spurs.
Ex-AC Milan and Chelsea boss baffled by Real's decision to sack Spaniard midway through season.
Danny Ward has kept 10 clean sheets in the league for Aberdeen.
Gareth Bale is disappointed with Real Madrid's decision to sack Rafael Benitez.
Arsene Wenger expects Liverpool stars to be fit before clash against Arsenal.
Mark Lawrenson expects Liverpool's injury crisis to subside ahead of Arsenal clash.
Joel Campbell has made 12 appearances this season in all competitions for Arsenal.
However, the manager admitted Mathieu Debuchy is struggling to deal with his lack of playing time.
Chelsea cruise into round four while Carlisle are held by Yeovil and Shrewsbury oust Cardiff.
The Italian refuses to criticise referee Robert Madley after controversial award.
The Dutch coach promises to given youth players more opportunities.
Live coverage of the all-Premier League FA Cup clash between Tottenham and Leicester.