Manchester United are reported to have sacked manager Michael Carrick after the Premier League club suffered their worst start to a campaign in 40 years.Carrick was only given the job full-time during the summer after guiding United to a third-place finish last season and back into the Uefa Champions League while interim manager.But the 45-year-old has overseen a disastrous run of one win in 10 Premier League matches leaving them 18th in the…