This article is part of Football FanCast's The Chalkboard series, which provides a tactical insight into teams, players, managers, potential signings and more... 

Tottenham made six changes to the starting line-up against Watford, but Mauricio Pochettino's decision to operate three centre-backs was a puzzling decision.

On the chalkboard

The Argentine has failed to settle on his best team so far this term, and he decided to operate in a more defensive style despite playing the side which was bottom of the league.

It is little surprise that he changed things at half-time with his team a goal down, bringing on Son Heung-min in search of an equaliser, but the fact he didn't start the South Korean raises some questions.

It shows a lack of belief in his players, particularly his defenders. Spurs may have conceded 11 goals in the three matches prior but they were playing a Hornets side with just five league goals, and therefore there wasn't a need for three centre-backs.

Doing so took away from the Tottenham attack, too, with only two shots on target in the entire match, underlining the fact that it was the wrong strategy for Pochettino to make.

Lack of faith

Players such as Danny Rose, Jan Vertonghen and Toby Alderweireld have been at the club for several years yet Pochettino still couldn't trust them to play in a back four on Saturday.

That says a lot about his current mindset and the predicament the club is in currently, and is a huge contrast to the settled side he had for most of last season.

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Pochettino's indecisiveness and lack of belief in his players is clearly having a negative effect on his players, with numerous players experiencing a downturn in form, including Christian Eriksen, Lucas Moura and Toby Alderweireld - all of whom have a WhoScored average league rating of 6.7.

The Argentine used to instil confidence in his players, but now the constant chopping and changing of personnel could be a signal to players that they aren't trusted, so it is not surprising to see players like Harry Kane describe the current period as his most difficult experience as a Spurs player.

As a result and if results are to improve, then Pochettino needs to go back to showing faith in his players and start rebuilding the feel-good factor that helped take the club to the Champions League final less than six months ago.