[4] With Molondro still out of action, Marcos made his first start in the Copa del Rey round of 16 second leg match at home to Recreativo de Huelva three days later.
He started 26 consecutive league matches, but following a 1–0 home win over Gimnàstic de Tarragona on 4 March he was dropped in favour of Molondro, and didn't play for the club again.
[2] While Mallorca Atlético finished the 1989–90 season in 14th, only four points clear of relegation, their rivals Orihuela Deportiva topped the group and were promoted to the Segunda División.
[2] He wasn't immediately first choice for his new club, with Juan Espín preferred at the start of the season,[10] but made his debut on 7 October in an away match against Elche at Estadio Manuel Martínez Valero.
[12] However, they were found to have failed to pay their players, and were punished with administrative relegation to Segunda División B. Marcos left at the end of the season.
[2] He made his first competitive appearance in over two years as he started both legs of Cartagena's Copa del Rey first round tie against Mar Menor.
They won the first leg, away from home, 1–0, but suffered a humiliating 2–0 defeat in the return fixture at Estadio Cartagonova, and were eliminated by their Tercera División opponents.
[2] His long-awaited Albacete and La Liga debut arrived on 18 September 1994, after more than three years at the club, as he started in the home fixture against Real Madrid at Estadio Carlos Belmonte.
[16] He played 10 more times that year,[16] establishing himself as a reliable back-up to future Spanish international José Francisco Molina,[17] who had joined from Valencia that summer.
Marcos played in both matches, as they lost 1–0 to Extremadura at Estadio Francisco de la Hera on 30 May,[21] and then by the same scoreline in the return leg three days later.
[2] He acted as back-up to Santander legend José María Ceballos,[23] although he did feature more prominently in the run to the Copa del Rey quarter-finals.
[25][26] Having also played in the away leg in that round, another 1–1 draw with Real Zaragoza at La Romareda, he finally made his home debut in the return fixture on 15 January.
[24] He also featured in the next match at home to Rayo Vallecano: Ceballos was sent off with nine minutes remaining, and Marcos was brought on in place of Fernando Correa to see out the game.
[28] Ceballos was injured in the second half of a 3–0 win over Extremadura at Estadio Francisco de la Hera on 7 March, and Marcos came off the bench to replace him.
[33] Marcos appeared in all six play-off games against Atlético Madrid B, Calahorra and Espanyol B, including keeping three crucial clean sheets,[32] as Ejido earned promotion to the Segunda División for the first time in their history.