Spurs and Chelsea are tracking Paris Saint-Germain left-back Layvin Kurzawa - and Manchester United are keen too.
The London rivals both want to reinforce the position, with the outgoing champions resigned to missing out again on Juventus' Alex Sandro.
Tottenham prepared to sell England international Danny Rose this summer for the right price.
Manchester United, set to cash in on Luke Shaw when the window opens, are also admirers of 25-year-old France international Kurzawa, who is available as PSG are looking to sell players before buying new ones.
Marcos Alonso, named in the Premier League's Team of the Year this week, is expected to remain at Stamford Bridge despite talk of a move home to Spain, but the Blues have been keen for some time to recruit more quality — despite signing Roma left-back Emerson Palmieri for £25m in January.
Wales international Ben Davies has impressed for Spurs at the position with Rose injured for much of the campaign.
Kurzawa joined PSG from Monaco in summer 2015, and has made 25 appearances this season — scoring five goals — as they close in on a domestic Treble.