Read Madrid midfielder Jude Bellingham has been suspended for two games by La Liga for showing contempt towards the referee having received a red card after the final whistle in their 2-2 draw with Valencia on Saturday.
Atletico were fined 2800 euros ($3,150), while Costa 6010 euros over the incident.
Barcelona star Neymar will miss the Clasico after receiving a three-match ban following his red card against Malaga, dealing a big blow to the Catalans who lie three points behind Real Madrid having played a game more than their rivals.
Frenchman Lenglet's first league start since his 36 million-euro move from Sevilla turned sour when he was shown a straight red card in the 35th minute at the Nou Camp following a coming together with Pons, after referee Jesus Gil Manzano consulted the video assistant referee (VAR).
The suspension was handed down by the Competition Committee of the Spanish Football Federation (RFEF) on Thursday and applies to Cup matches only.
La Liga leaders Barcelona drew 0-0 at Huesca on Saturday and are nine points clear of second-placed Atletico Madrid, who cut the gap by beating Celta Vigo 2-0.
Luis Suarez was incredulous after being sent off in Barcelona's thrilling King's Cup semi-final second leg with Atletico Madrid on Tuesday, ruling him out of the final in May after playing a pivotal role in getting his team there.
France stretched their unbeaten run against Croatia to eight games after a late goal by Kylian Mbappe gave the world champions a 2-1 win in their Nations League top-tier Group 3 match on Wednesday.
Barcelona closed in on the La Liga title after beating 10-man Atletico Madrid 2-0 in Saturday's top-of-the-table showdown at the Nou Camp as late strikes by Luis Suarez and Lionel Messi gave the Catalans an 11-point lead at the top of the table.