With the winter transfer window fast approaching, speculation is beginning to grow.January tends to be quieter than the summer as clubs use the mid-season market to strengthen in areas that may be depleted due to injuries or severe lack of form.It is rare for big-name players to move clubs in the winter window, but there is one man who is likely to come up in the gossip pages – Virgil van Dijk.The Southampton defender was heavily linked with a switch to Liverpool in the summer, but the Dutchman’s club refused to sell.If Van Dijk still harbours a desire to move on, perhaps a January transfer will be feasible.Former Arsenal striker Kevin Campbell thinks that manager Arsene Wenger should try to sign he 26-year-old in order to bolster the team’s options in defence.The retired footballer, who also played for Everton in his career, made the suggestion in response to a fan’s question on Twitter.