Jared Leto's arm injury seems to be no joke as he is seen with a sling... while attempting to go incognito by hiding green hair in cap

He plays Batman's mortal enemy The Joker in the upcoming Suicide Squad film.

But perhaps Jared Leto's arm was victim to a tussle with the Caped Crusader.

The 43-year-old star was spotted with a sling on his right arm during a stroll in the Tribeca neighbourhood of New York on Friday. 

Disarmed: Jared Leto was spotted with a sling on his arm during an outing in the Tribeca neighbourhood of New York on Friday

Disarmed: Jared Leto was spotted with a sling on his arm during an outing in the Tribeca neighbourhood of New York on Friday

Clown prince of crime: The 43-year-old star tried going incognito with a black cap worn low but his neon green locks were hard to miss as he will play baddie The Joker in his next flick

Clown prince of crime: The 43-year-old star tried going incognito with a black cap worn low but his neon green locks were hard to miss as he will play baddie The Joker in his next flick

The Thirty Seconds Mars frontman attempted to go incognito by wearing his black trucker cap down low over his eyes, but was unmistakable with his neon green hair.

Jared dressed comfortably as he wore a rather interesting outfit including a pair of black jogging trousers with a large red stripe along the side, bright pastel striped socks and checkered black and white slip-on sneakers.

He also sported a red, white and black checked flannel over a blue shirt with 'Nepal, I love you.' emblazoned on it.

Comfortable customer: Despite the sling, the Thirty Seconds To Mars frontman looked comfortable in a red checked flannel over a blue shirt 

Comfortable customer: Despite the sling, the Thirty Seconds To Mars frontman looked comfortable in a red checked flannel over a blue shirt 

It remains unknown what exactly happened to Jared's arm, but fans were left wondering how the injury occurred as he shared a picture of him with a sling on Saturday

There was no explanation given along with the black and white selfie taken on an airport but only a caption reading: 'The adventure begins again #GreatWideOpen.'

It certainly seems like Jared is getting into the role of playing baddie The Joker as he reportedly sent his castmates some very creepy gifts as a gesture when he couldn't be there for the start of filming.

Adam Beach, who plays Slipknot in the highly anticipated action flick, told E! News 'He sent [Margot Robbie] a nice love letter with a black box with a rat in it - a live rat,'

He's not joking around! He sported a pair of athletic trousers with a large red stripe down the side along with bright striped socks and checkered Vans slip-on sneakers 

He's not joking around! He sported a pair of athletic trousers with a large red stripe down the side along with bright striped socks and checkered Vans slip-on sneakers 

Margot, 24, plays Jared's onscreen girlfriend Harley Quinn in the movie about a team of comic book bad guys who are assembled by the government to undergo extremely dangerous missions in return for reduced prison sentences.

Adam explained during the premiere of Joe Dirt 2: Beautiful Loser on Wednesday: 'It was beautiful. Then he sent bullets to Will [Smith] with a letter.'

But that's not all, the Oscar-winning actor also sent the cast a dead hog along with a video message.

What happened? Jared has yet to explain what exactly happened to his arm but he shocked fans with this picture of it in the sling on Saturday

What happened? Jared has yet to explain what exactly happened to his arm but he shocked fans with this picture of it in the sling on Saturday

Adam revealed: 'Basically, what he said was, "Guys, I can't be there but I want you to know I'm doing my work as hard as you guys,"

'The video he showed is in character. It blew our minds away. Then we realized that day, this is real.'

 Jared has quite big shoes to fill as Joker predecessors before him include Jack Nicholson, Mark Hamill and the late Heath Ledger.

Suicide Squad is set for release August 5 2016. 

Baddie: Back in May, Jared was spotted in his role as The Joker in the upcoming Suicide Squad flick set for release August 5 2016

Baddie: Back in May, Jared was spotted in his role as The Joker in the upcoming Suicide Squad flick set for release August 5 2016

Motley crew: His co-star Margot Robbie shared a group snap on her Instagram of most of the cast, sans Jared, back in May. She is seen centre dressed as Harley Quinn

Motley crew: His co-star Margot Robbie shared a group snap on her Instagram of most of the cast, sans Jared, back in May. She is seen centre dressed as Harley Quinn

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