Joe Cole gave Chelsea a piece of transfer advice last month that now looks brilliant based on something that happened in the Champions League last night. Chelsea are staring down the barrel of a second straight season of mediocrity. The Blues are ninth-placed in the Premier League table facing an uphill battle to qualify for Europe. Plus, they face Manchester City in an FA Cup semi-final, which is their last chance of winning a trophy this campaign. LondonWorld reports that Chelsea’s owners are standing firm by Mauricio Pochettino and will assess the manager’s situation in the summer. We think…