Red Bull's team boss was thoroughly impressed by Daniel Ricciardo's performance in the RB19 at the recent tire test in Silverstone. The Australian's laptimes were reportedly within a second of Max Verstappen and Sergio Perez, earning him a drive at AlphaTauri for the remainder of the season.Ricciardo has been out of an F1 car for a long time now, having moved back to Red Bull after an unsuccessful two-year stint with McLaren.Despite his lack of practice, the Australian was able to deliver lap times that thoroughly impressed Christian Horner and Co.Fastest Pitstop@FastestPitStopDaniel Ricciardo's garage in Hungary ahead of the Grand Prix #F1 #HungarianGP13854490Daniel Ricciardo's garage in Hungary ahead of the Grand Prix 👀#F1 #HungarianGP https://t.co/iZNZgAuKdbSpeaking about Daniel Ricciardo's performance at Silverstone, Horner told the F1 Nation podcast:"What impressed me the most. I went up to have a look at the test - bare in mind that he hasn't driven this car, hasn't driven in a car for several months - within his third or fourth lap he was down to a time that was within a second of what our drivers were achieving."He continued:"On his first proper run on tyres that were comparable, you could see his confidence was growing and growing. On that first lap - what was probably his seventh lap of the day - would have put him on the front row of the grid."Daniel Ricciardo claims he was always ready to step in for Max Verstappen or Sergio Perez if neededmic@ricciardanielITS A DANIEL RICCIARDO RACE WEEK78131210ITS A DANIEL RICCIARDO RACE WEEK https://t.co/C9vy78z1l7Daniel Ricciardo claims he was 'always ready' to step in for Max Verstappen or Sergio Perez if he had to in 2023. The Australian did find a way to drive the RB19, earning him a drive at AlphaTauri for the remainder of the season.Ricciardo will replace Nyck de Vries come Hungary, following the Dutchman's poor form against Yuki Tsunoda.While the eight-time GP winner was brought on as a third driver for Red Bull in 2023, he claims he was always ready to take Max Verstappen's or Sergio Perez's place if needed.As quoted by GPBlog, Daniel Ricciardo said:"In recent years, of course, I've been part of Red Bull Racing, apart from the little break, but I've been part of the Red Bull family for so long that I know these things can happen."He added:"Of course I was also ready for Max or Checo if they became unwell or ill. I was always ready and it's an unpredictable sport, so I think I always had to be ready."It will be interesting to watch Ricciardo go head-to-head with Tsunoda this weekend in Hungary.