The ex-F1 driver, now an expert for Sky Germany, claimed that Sergio Perez’s “days are numbered” at Red Bull.Red Bull consultant Marko has now offered a typical response to Ralf’s prediction.“Hopefully he didn't mean that Mick Schumacher would have to replace him,” he laughed to OE25. Perez has a deal with Red Bull until the end of next season but has been under immense pressure to keep his seat in F1’s best car.Last weekend, team principal Christian Horner’s backing of Perez was at odds with Marko’s harsher verdict.Asked to clarify his opinion of Perez’s role, Marko said: “Now he has a…