Isn't that the defense that Conte needs to evaluate, if you look at Tottenham's game when they lost to Arsenal and Manchester City, it's quite clear that their defense was not strong enough to withstand the attacks built by Arsenal and Manchester City. Attackers in the Premier League have running speed as you say, meaning that their defense also has to be able to offset or break attacks when the midfielders start to carry the ball and before giving feedback to the attackers.
Based on the statistics in the last 20 matches, Tottenham's defense is indeed problematic because they have conceded more than 30 goals in 20 matches. Tottenham are conceding an average of 1.55 goals per game and that is only 9 goals less than their total conceded during last season in the Premier League. It's clear that their defense has been verry bad this season and Conte should expect some improvement in his side's defense for the rest of the season.
Even though Tottenham have brought in 3 defenders this season, their defense looks really bad. Cristian Romero, Clément Lenglet, Djed Spence are the 3 defenders with the same goal that Tottenham have signed over the course of the season but it seems their performances haven't had a great impact in defence.
What do you think of the result of the match between Arsenal and Manchester United later?
Draw, yes I think it will be an interesting match with draw in the end.