Look: Le'Veon Bell is still upset with contract situation

Pittsburgh Steelers running back Le'Veon Bell's frustration with his contract has been a major storyline throughout the NFL offseason, and it doesn't appear to be over yet.

After it was announced Thursday that the Steelers signed general manager Kevin Colbert to a two-year extension, Bell sarcastically tweeted his congratulations:

Bell later took it a step further by throwing further shade at the club for seemingly rewarding everybody but him, after teammate Ramon Foster posted a picture on Instagram poking fun at the situation:

Related - Watch: Bell appears to stump for $17M in rap to Steelers teammates

Bell has yet to sign the $12.12-million franchise tag exercised by the club, and reportedly turned down a five-year deal worth $12 million annually earlier in the offseason in his quest to reset the market for his position.

Bell previously tweeted he would report to the club Sept. 1, but it shouldn't come as a surprise if tensions are high when he does.