Marquee signing for Doncaster Rovers boss Darren Ferguson

Marquis joins on a two-year deal from Millwall. He scored six goals in 16 games of a loan spell with League Two champions Northampton last season.

Rovers manager Darren Ferguson said: “John has been on our radar for quite a while now, the squad is now starting to take shape.

“He’s a tireless worker who leads the line well and doesn’t give defenders a moments rest. He’s a good age and we’re hoping that his move here can provide him with a new challenge.

“John’s experience of success at this level with Northampton could prove vital and we’re delighted to have him on board.”