Dimitar Berbatov admits Tottenham face an uphill task against Ajax in Tuesday night's semi-final second leg.
Spurs must overturn a 1-0 deficit in Amsterdam if they are to reach the Champions League final.
Berbatov told Betfair : "I was surprised at how tame Spurs were in the first half an hour of the home leg last week, they just let Ajax play and the Dutch are not a team you want to do that against. They are fearless, with an unbelievable style of play, building attacks with vision and dangerous passes; simply a joy to watch.
" Tottenham have a very difficult job on their hands now and, if they approach Wednesday's game in the same way, they will have real problems.
"We shouldn't forget, though, that Spurs were missing some vitally important players last week - most notably Kane, Son, Winks and, at the start at least, Sissoko - so we'll see how much better they are with at least a couple of those players back.
"Having Son Heung-min back in particular is a big boost and we know that Spurs have the quality on their day to beat anyone but I fear this will be a step too far against a top-quality Ajax side.
"Going down to nine men at Bournemouth just highlighted the tension and nervousness that Tottenham have suffered from in recent weeks. To be a top team, you need to know how to be clever, to not lose your cool, not to concede in injury time - this is what they need to fix.
"Spurs have all the ingredients to be a top team, they just need the consistency - it's what Liverpool and City have shown all season and is the reason they are challenging for the title."
