Fletcher has been in good goalscoring form, but would like the defence to tighten up.
The Black Cats have proved that they are a goal threat to other sides, but also to themselves after the weekend's 6-2 defeat to Everton, which leaves them two points adrift of safety after 11 games.
The Scot is quoted in the Chronicle, saying: “He has us going into games with more confidence and it showed at Everton in the first 20 minutes. Had we scored our chances in those early moments we would have been 2-0 up and it would have been completely different. It was frustrating in the end. I think it is the silly mistakes that we need to cut out, massively. In the Premier League if you make one mistake then teams will pounce on you.
“We are creating chances though which is a good thing. Hopefully we can stop conceding so many and we will be alright.
“The amount of chances we got on Sunday was the most chances I have ever had in a game since I moved to Sunderland.
“It’s good in that aspect, but we need to keep the door shut at the other end.
“If I knew how (to do that) then I’d be a manager – I really don’t know. The first 20 minutes we had chances, Everton’s fans would have been on them but the end result is what counts.”
After the derby win over Newcastle United, the result against Everton brought them back down to earth with a bump, but the side did have their opportunities at 0-0 - hitting the post twice and managing to fight back from 2-0 down to level the match before Everton ran away with the game.
Only the one clean sheet so far this season needs to be improved upon, but it will be encouraging for fans to see the firepower they have at their disposal. But if they don't start keeping more clean sheets, it's going to be incredibly difficult for them going forward.