Tottenham boss Mauricio Pochettino refused to concede the Premier League title despite the 1-0 defeat at West Ham.
Tottenham are now four points behind Antonio Conte's side, who have a game in hand over Spurs against Middlesbrough on Monday night.
Alli had scored four goals in six games coming into the match but the 21-year-old struggled as Spurs fell to Manuel Lanzini's second-half strike.
If they win the two matches, they will claim their fifth Premier League crown.
"With three games to play".
Speaking on Sky Sports on Friday night, Pardew said: "Tottenham have played the best football but Chelsea have been the best team".
"It's the second season we are fighting for the Premier League". 'We have to wait but are thinking that it will be hard to catch Chelsea.
Tottenham's tame surrender recalled their collapse at the end of last season when they squandered opportunities to catch eventual champions Leicester.More news: White Tulsa police officer acquitted over fatal shooting of unarmed black man
"We have one week to prepare well for this game, put in the right energy and try to finish unbeaten at home".
Few people in either camp would have foreseen any other outcome, either, with West Ham limping towards the finishing line of what has been a torrid season.
The Spurs players looked disconsolate as they trudged off the pitch, their heads bowed, while their West Ham counterparts - and the home fans - took great delight in harming their neighbours' title ambitions.
"It was a hard game and if you compare (it) with five days ago against Arsenal, I think it was a different game and it wasn't the same performance that we played last week". "And today was a key moment that and we couldn't show that thing".
"I'm not really pleased with the way we played this game", Lloris said before leaving the Olympic Stadium.
Eriksen lashed over but Tottenham were running on empty, with West Ham substitute Ashley Fletcher going agonisingly close to number two just before a final whistle that will have prompted significant celebrations in west London.
Harry Kane had the brightest chance in the first half to shoot Tottenham ahead, but his shot was saved by the outstretched leg of Adrian.