*Man United: Solkskjaer announces date for Ronaldo’s second debut*   Portuguese star forward Cristiano Ronaldo, who has transferred from Juventus to Manchester United, will make his debut at the English club on September 11.   AFP quoted Manchester United manager Ole Gunnar Solskjaer, as saying this on Sunday.   On that day, the Manchester team will host Newcastle in the fourth round of the English Premier League.   Ronaldo had played for Manchester United from 2003 to 2009 as well. Ronaldo’s move back to United must be completed before the summer transfer window closes on Tuesday night and Solskjaer is