Leighton Baines believes Sam Allardyce wants to add greater balance to Everton's starting line-up.
How will Everton's starting XI look as they host Stoke City on Saturday?
Cuco Martina has played regularly for Everton but the Toffees could reinforce their defence by signing Craig Dawson from Premier League rivals West Brom.
Cuco Martina's place in the Everton side is under threat.
The Dutch-born Everton full-back has been filling in on his unnatural side in place of the injured Leighton Baines.
Ronald Koeman's decision not to sign a proper left-back for Everton is costing Sam Allardyce.
Everton have had a few problems at full-back this season.
Martina joined Everton from Southampton at the beginning of the season and looks to have endeared himself to the Goodison Park faithful.
Everton defender Cuco Martina has been earning praise over recent weeks.
Martina has deputised at left-back for the injured Leighton Baines at Everton.