Transfer news: Mario Balotelli's agent Mino Raiola tells Sky Sports News HQ the Italy striker is happy at Liverpool
Mario Balotelli's agent has told Sky Sports News HQ the Italy striker is "happy at Liverpool" and gets on well with Brendan Rodgers.
Italy striker Antonio Cassano has left troubled Serie A club Parma after rescinding his contract.
Wellens, 33, returned to the club from Leicester City in the summer and has played 24 times this season in the south Yorkshire club's return to the Championship, collecting eight yellow cards.
Chief executive Gavin Baldwin said: "The owners and manager have worked incredibly hard to ensure we manage to keep Richie at the club long term.
"This is great news for everyone involved and a clear signal of the owners intent for the future of Doncaster Rovers."
Wellens, who started his career at Manchester United, played for Blackpool and Oldham Athletic before his first spell with Doncaster began in the summer of 2007.
He left Rovers to join the Foxes for a fee of £1.2 million in 2009 before rejoining Doncaster last summer in a short-term deal after a loan spell with Ipswich Town.