After 394 appearances for the club, the England midfielder believes it would be inappropriate behaviour should he find the net for AC Milan.
United face the Italians in the Champions League at the San Siro a week on Tuesday, with the return leg on March 10 at Old Trafford.
It is the first time Beckham has faced his former club and he remains grateful to the fans who backed him after he was sent off against Argentina in the 1998 World Cup.
He told Inside United: "Sometimes emotion can get the better of you when you score but I do not think I would celebrate. I respect the supporters and the club.
"The relationship I have with the fans is still important to me. I went through some difficult times but they never stopped supporting me.
"I would not have got through everything without them. To me they are the best fans in the world and the support they gave me week in, week out was incredible. Nothing will ever better that."
Beckham, on loan to Milan from Los Angeles Galaxy, has an abiding affection for the Barclays Premier League champions.
He added: "I always wish I was part of Manchester United, it is just in me. Even though I am not there any more, I am still a huge fan.
"Coming to terms with not being a United player was certainly the toughest thing I've ever had to deal with.
Beckham view
"When you are a Manchester United player and a Manchester United fan you never want to play for any other club.
"I always want them to do well and be successful because the club still means so much to me. I've still got season tickets and I will always keep them because I love to watch every game where possible.
"I would love to take my sons one day. United will always be such a special place to me, so we will just have to see what the future holds."
Beckham's 13-year spell at United, in which he scored 85 goals, ended in July 2003 when he moved to Real Madrid and he admits he found it difficult to cope.
The England midfielder said: "United was the club I always wanted to play for and I loved every minute of my time there. The first few years (after leaving) were hard and there were a lot of things I missed.
"When I was at Real Madrid it just never felt right to come back to Old Trafford. The thought of playing against United always gave me that sick feeling because I missed the club so much.
"But when the draw was made this time it felt as though it was the right time to go back. I felt really emotional.
"It will also be extremely emotional for myself and my family on the night. I met so many amazing people during my time there, on and off the pitch, that I am looking forward to seeing everyone again.
"It is the biggest club in the world and it is one you always want to be a part of."
Has Beckham's game declined since he left United? Have your say.
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Showing comments 1 to 25 and replies | View All
jordy, Middleton (08/02/2010 at 16:28)
Erik Duus (08/02/2010 at 16:41)
Personally i think he had som great games at Real Madrid and that he would have had great impact if he had played for United. And that he at the moment plays for AC Milan, one of the biggest club in the world, only says that he's still got it!
Erik Duus (08/02/2010 at 16:42)
Personally i think he had som great games at Real Madrid and that he would have had great impact if he had played for United. And that he at the moment plays for AC Milan, one of the biggest club in the world, only says that he's still got it!
Red Army (08/02/2010 at 16:44)
Gilly, Belgium (08/02/2010 at 16:48)
I dont know if his game has changed all that much, he got older and i think he is still a dead ball master , those crosses into the box are unbeatable !
Sean , NYXMC (08/02/2010 at 16:52)
Enzie, Red Heaven (08/02/2010 at 16:53)
A fantastic player for us who clearly loves the club, still feel Ferguson doesnt really think much of him, but iv got nothing but admiration for the bloke. Looking forward to seeing him in March, and the way his career has panned out i wouldnt be suprised if....Im not even gonna say it.
Silvestre's Easter Island Head (08/02/2010 at 16:58)
I saw Duncan Edwards play, Walton Le Dale (08/02/2010 at 16:59)
keithmat (08/02/2010 at 17:19)
manc abroad, OT (08/02/2010 at 17:52)
Uwe the Goat, Brighton (08/02/2010 at 18:13)
Mr-T (08/02/2010 at 18:22)
Mrs Fullaway's lodger, LUHG (08/02/2010 at 18:39)
Britt/Canada (08/02/2010 at 18:42)
BALL AND BAT, ALL OVER (08/02/2010 at 19:03)
Morrissey United, Denton, Manc. (08/02/2010 at 19:08)
vt5060 (08/02/2010 at 19:15)
Morrissey United, Denton, Manc. (08/02/2010 at 19:57)
Green and Gold MOFO!, manchester (08/02/2010 at 20:02)
LUHG
Roger, Ontario, Ontario (08/02/2010 at 20:04)
Green and Gold MOFO!, manchester (08/02/2010 at 20:11)
All that said though i for one will be on my feet cheering him on to the pitch.
LUHG
ted knott, droylsden (08/02/2010 at 20:18)
Like Denis Law if Beckham doesn't relish the prospect of scoring against his former team then why bother playing in the match?
Like Denis Law was Becks will be a traitor and certainly unprofessional if he goes into the game not wanting to score and if he doesn't well creating a goal is as bad--YES like Law should have Beckham needs to get his priorities in order but I'm sure Jose Mourinho has noted his comments... ha ha ha ha ha wouldn't it be ironic if Becks scored the deciding goal with a 'BACKHEELER' flick? PRICELESS...
keith brando (08/02/2010 at 20:24)
beckham didnt set the world on fire when he went so fergi was right yet again. I think only strachen when he was playing got he better of ferguson when he left old trafford???
Steve from Hyde, Tameside (08/02/2010 at 20:44)
2 months ago: "If I score aginst United I won't celebrate out of respect to the manager"
1 month ago: "If I score aginst United I won't celebrate out of respect to the lovely stadium"
1 week ago: "If I score aginst United I won't celebrate out of respect to the fans who adored me"
1 hour ago: "If I score aginst United I won't celebrate out of respect to the cleaners who did my kit"
1 minute ago: "If I score aginst United I won't celebrate out of respect to the tea ladies (who gave me my Horlicks and read me bedtime stories)"
I think even the most stupid of readers just about gets the message by now David...
Yawn.....