Willis is out of contract this summer and is highly sought after. The report claims Luton Town, Hull City, Sheffield Wednesday and Derby County are among the Championship sides tracking him.
But it seems Bristol City are winning the race. Manger Lee Johnson is keen to strengthen this summer after just missing out on the play-offs last term, and central defence is an area for improvement.
Willis has become a mainstay at the back for Coventry, making over 200 appearances for the Sky Blues as he helped the club to a top-half finish in League One last term.
Willis could represent a real steal for Bristol City on a free transfer, and the Robins could look to partner him alongside the impressive Adam Webster following his move from Ipswich Town 12 months ago.
The big-money sale of left-back Lloyd Kelly for a reported £13 million should give City extra room to bolster their squad this summer and a few top-quality additions could make them contenders for promotion.
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