Spurs boss Andre Villas-Boas.
Spurs keeper Hugo Lloris believes Arsenal remain the biggest threat to his side's hopes of securing a top four finish.
Tottenham face Lloris' former club Lyon in the Europa League on Thursday and boss Andre Villas-Boas is keen to go as far as possible in the competition this season, but the club's top target is to ensure they're involved in the Champions League next season.
Spurs are currently fourth in the league and four points clear of their north London rivals, but Lloris is well aware that Arsenal will give their all to secure a top four finish in the closing stages of the campaign.
"For the minute, the season has been promising," he told French radio station RTL.
"But the hardest part is yet to come because there are still a number of key matches to be played and we'll have to be ready for that.
"For the moment, we're well placed, though we're not beyond a possible charge by Arsenal."
Spurs are 1.72 to secure a top four finish and Arsenal can be backed at 1.90.
The White Hart Lane outfit are 1.80 to win their last 32 first-leg tie with Lyon on Thursday, the draw is 3.50 and the French side can be backed at 4.50.
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