'Nobody will be more delighted than me if they get promoted but hopefully it won't be on Monday night,' Speed said.
Related ArticlesNewcastle edge towards promotionPeterborough 2 Newcastle 3Nolan hails Newcastle 'revolution'Billy Davies: Ashley must spend bigNewcastle 2 Forest 0Hughton wants to extend Newcastle deal'St James' Park is a great place to play football and I'll be telling the lads that on Monday night and hopefully we can go and spoil the party but I think that Newcastle will go on and get promoted eventually.'
The Championship leaders could have already secured promotion before kick-off should Nottingham Forest fail to beat Cardiff in Monday's tea-time game but otherwise will need a point to regain Premier League status against a side with their own play-off ambitions.
'I don't think they will take their foot off the pedal and if they are already promoted then I think that will make it worse for us,' Speed, 40, added.
'There would be a party atmosphere there and the players might relax and totally enjoy the occasion and make it more difficult for us. We just have to concentrate on ourselves and getting a result because we still have something to play for.'
Newcastle beat Sheffield United at Bramall Lane 1-0 last November thanks to Chris Morgan's own-goal and a brilliant display by visiting goalkeeper Steve Harper so Speed will be hoping for a reversal of fortune to keep alive the club's own promotion ambitions.
'We are a bit up and down at the moment at Sheffield United so it will be a difficult game for us, especially if there is a party atmosphere at St James',' said Speed who spent six years on Tyneside.
'We have had an up and down season. We have had a lot of new players in and so many loan players this season it has been frightening. That continuity we had last season that got us into the play-offs we haven't had this season so we have found it difficult to get a consistent run of results together.'