Boro are among a host of clubs keeping tabs on Willem II striker Fran Sol ahead of the January transfer window.
Tony Pulis is said to have sent scouts to watch the 26-year-old, who is enjoying a fine campaign in the Eredivisie.
The Spaniard has scored 15 goals in 18 appearances in all competitions this season and his tally of twelve league goals can only be bettered by PSV’s Luuk de Jong.
But Boro face stiff competition should they look to launch a January bid.
Celtic and Rangers have also checked in on him in recent months and have received ‘glowing reports’, according to TEAMtalk.
Sol’s contract expires at the end of the season, which has put interested clubs on red alert.
Willem have the option of a further year on his current deal but face a fight to keep him on their books.
Premier League sides Burnley, Cardiff and Huddersfield as well as Boro’s Championship rivals Leeds, Derby and Swansea are also said to be keen.
Boro are in need of some inspiration to end their troubles in front of goal and are looking to sharpen their weaponry in the final third.
Crystal Palace’s Connor Wickham has been linked with a move to the Riverside in recent days with doubts over Britt Assombalonga’s future.
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