Manchester United transfer rumours: Mats Hummels' Borussia Dortmund future in doubt after defender criticises club form

Manchester United defender target Mats Hummels has reportedly raised questions over his Borussia Dortmund future after deeming the club "pathetic".

According to the Mirror, the German defender, who is one of United's primary January targets could be set to leave after his comments following the Bundesliga club's shocking start to the season.

Dortmund end 2014 at 17th spot in the league following their latest 2-1 loss against Werder Bremen, before the Bundelisga heads into its winter break.

Jurgen Klopp's team have struggled to match their performances in recent seasons and despite reaching the last 16 stage in the Champions League, they are struggling to get wins in the domestic competition having won just 4 out of their 17 league games leaving them tied on 15 points with bottom placed club Freiburg.

Hummels, who has been constantly linked with a move to Old Trafford, amid interest from various other top European clubs, will reportedly cost upwards of £45m to sign in the upcoming January transfer window.

However, with poor results frustrating the player and his manager, both their futures have come into question in the long run with Jurgen Klopp being touted as a possible replacement for Liverpool boss Brendan Rodgers.

"We've managed pretty well at home in recent weeks, but not at all away. It's pretty astonishing that we are so pathetic," Hummels said, as quoted by the Mirror.

But Klopp, who has been linked with a move away from the club, is refusing to throw in the towel. He has vowed to stay at the club and fix all the wrongs and bring his club back to where they belong.

"I am totally responsible and I am not just going to throw in the towel. We are going to put right what we've done wrong," the Dortmund manager explained.