In League Two, Northampton finished fourth last campaign, with 80 points from 46 games. Despite qualifying for the playoffs, they were not able to qualify for the next division.
Stevenage will be welcoming West Bromwich Albion for a pre-season friendly on Saturday.
Monday’s clash, which will take place in Portugal, will see the Championship outfit facing League Two side.
Rondon reunites with Blues manager Rafa Benitez following a productive season working with the Spaniard at Newcastle United in 2018/19.
Both summer signings started on Wednesday as Arsenal eased into the round three of the Carabao Cup with a 6-0 win at West Bromwich Albion.
Arsenal registered their first victory of the new season – a 6-0 thumping of West Bromwich Albion in the Carabao Cup.
Arsenal will play West Brom in their opening match of the Carabao Cup this season and Arteta is keen to do well in the competition.
Matheus Pereira says he feels "disrespected" at West Brom and has publicly signalled his desire to leave the club "in a fair and correct manner".
Brentford, along with Norwich City and Watford will replace Sheffield United, West Bromwich Albion, and Fulham in the Premier League.
West Ham beat West Brom 3-1 at get closer the Europa League qualification, Arsenal and Everton post wins to keep their European Conference League hopes alive.