The Northern Irishman, who was voted BBC Sports Personality of the Year, will have to decide nearer the time whether to stay loyal to the 2010 winner or choose another horse owned by his employer JP McManus, with Welsh National winner Synchronised among the possibles.
Don't Push It ran an encouraging race at the Cheltenham Festival when a staying-on 10th in the Pertemps Final, the same contest used for his Aintree preparation last year.
Champion trainer Nicholls is himself seeking his first Grand National victory and has one of the leading ante-post market leaders in Niche Market, who has been allocated 10st 13lb.
Nicholls has indicated he believes Ruby Walsh could ride him, although the top Irish jockey could also pick from the Willie Mullins entries.
The highest rated of the Mullins team are Dooneys Gate (11st 4lb) and Scotsirish (11st 2lb).
Behind the top weight, Howard Johnson's Tidal Bay has been allotted 11st 9lb for what would be a first try over the National fences, while the Neil Mulholland-trained Midnight Chase is next on 11st 8lb.
Ballabriggs, who is as low as 14-1 with some bookmakers, has been handed 11st.
RECENT NATIONAL WINNERS
2010 Don't Push It 10-1
209 Mon Mome 100-1
2008 Comply Or Die 7-1
2007 Silver Birch 33-1
2006 Numbersixvalverde 11-1
2005 Hedgehunter 7-1
Other interesting contenders include Big Fella Thanks (11st 1lb) and West End Rocker (10st 5lb).
Merigo won last year's Scottish National and he has been given 10st 1lb in the initial list while the 2010 Irish National winner Bluesea Cracker has 10st 4lb.
Becauseicouldntsee is another to note on 10st 8lb while Evan Williams has State Of Play (10st 6lb) who has finished fourth and third in the last two renewals.
Some of last year's runners could be back for another crack with fifth Hello Bud (10st 5lb), and seventh Character Building (10st 4lb) among the entries.
David Pipe sent out Comply Or Die to win in 2008 and that horse has 10st 8lb this time while stablemate Or Noir De Somoza has 11st 5lb.
Dermot Weld's Majestic Concorde is an eyecatching entry on 11st 5lb, while Jonjo O'Neill's Quolibet has 10st 8lb.
The final weights will rise if Don't Push It does not run.
Grand National entries scratched: Deep Purple, Tatenen
Aintree Grand National entries
Number Form Name Weight Age Trainer
1) 23P1-P000 DON'T PUSH IT (IRE) 11-11-10 Jonjo O'Neill
2) 104-3226 TIDAL BAY (IRE) 10-11-09 Howard Johnson
3) 1-411115 MIDNIGHT CHASE 9-11-08 Neil Mulholland
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