By Editor Wayne Veysey | Former Evening Standard, Press Association and Goal chief correspondent with 17 years experience of breaking big stories, including exclusives like this

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Tottenham are set to make defensive reinforcements this summer, Football Insider sources understand.

Manager Mauricio Pochettino is targeting new defenders despite having the meanest back line in the Premier League in the 2015-16 season.

The London club’s title challenge was built upon a defence that has conceded just 35 goals in 38 league matches, the equal-best record in the division along with Manchester United.

A Tottenham recruitment source has told Football Insider that the club are in the market for players in the centre-back position.

Toby Alderweireld was named in the PFA Premier League team of the season after forming an outstanding centre-back partnership with fellow Belgian Jan Vertonghen.

Either side of them, Danny Rose and Kyle Walker have had fine seasons in the full-back positions, while defensive understudies Kevin Wimmer, Ben Davies and Kieran Trippier have all stood in impressively at various times.

But Spurs want more defensive options as they prepare for a return to the Champions League next season.

Following Eric Dier’s transformation this season into a midfield anchorman for club and country, Pochettino has only three senior centre-backs.

Milos Veljkovic joined Bundesliga side Werder Bremen on the final day of the January window, while Federico Fazio moved to Sevilla on loan ahead of a possible permanent move to the Spanish side in the summer.

One player they are closely monitoring is 22-year-old Lyon defender Samuel Umtiti.

Pochettino has confirmed he is monitoring the versatile defender, while West Ham have also been strongly linked with him.

In other Tottenham transfer news, the club are closing in on two deals costing £42million in total.