​Borussia Dortmund have entered the race to sign out-of-favour Olivier Giroud after the striker admitted his Arsenal career was in jeopardy.

The Bundesliga giants have joined Everton, Marseille, AC Milan and West Ham United in the hunt for the 30-year-old, according to the ​Daily Mirror, after doubts were cast over his Gunners future following the £52m arrival of compatriot Alexandre Lacazette.

Giroud had already claimed his time at the Emirates may be coming to an end, with an interview with ​Sky Sports suggesting that he may not be at the club by the start of the new season, and a bidding war could now emerge as the five interested parties tussle it out for his signature.

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Dortmund could be on the lookout for a new established centre forward as reports grow over an impending £60m move for star striker Pierre-Emerick Aubameyang to Chelsea - a transfer that would free up funds and a starting berth for Giroud.

Peter Bosz's side would, however, face stern competition from a quartet of other European sides to land him, with Marseille and Everton hotly tipped to make offers for Giroud already this summer.

The France international will be desperate to gain regular first-team football in the next year to book his place in his national side's 23-man travelling party to next summer's World Cup in Russia, and chances are his opportunities in Arsenal's senior side would be few and far between.

Giroud already suffered the indignation of being dropped to the bench by Arsene Wenger in the first half of last season as Alexis Sanchez led the Gunners' attack, and the acquisition of Lacazette will only reduce his chances of starts and minutes further.

The former Montpellier star was asked whether he saw himself staying with the FA Cup winners after helping the club launch its new third strip for 2017/18 in Sydney, but Giroud admitted that he was "unsure" if he would be part of Wenger's plans for next term.

He said: "I honestly don't know. At the moment I'm still an Arsenal player so I'll try to be professional like always and prepare well for next season.

"Obviously there will be more competition, even more than last year, but it's always nice for a striker to feel the pressure and I always deal with it.

"I've been through some difficulties these last years but always succeeded to bounce back, but this one I don't know. I don't know about my future so I can't tell you more. I'm focused on my pre-season."