The pair were former team-mates at Chelsea and the Southampton full-back remembers his quality.
The weekend football is at an end, unless you count Monday Night Football as part of your extended calendar. If you do, then the weekend will round up when Southampton take on Manchester United in the Premier League tomorrow night.
The high-flying Saints have been taken back down to earth recently. Defeats against Arsenal and Manchester City has seen them leapfrogged by West Ham in the Premier League, for now.
Manchester United on the other hand are on the up. They have shown great form and great resilience recently in order to force their way back up the table.
This game is therefore a straight shootout for fourth spot in the Premier League.
Southampton have had an excellent start to the campaign, made more fantastic by the departure of several star men. One of those was defender Luke Shaw, who of course joined Manchester United for £30 million this summer.
In his place Southampton signed Ryan Bertrand on a season long loan deal from Chelsea. The Champions League winner has excelled as the replacement for the England international and will have to be on top form to keep United at bay tomorrow.
One player he is particularly wary of however is Spanish playmaker Juan Mata.
He played with the diminutive Spaniard during their time together at Chelsea and said of him in an interview with the official Southampton website today:
"He [Mata] is a fantastic player. In the years we spent together at Chelsea, seeing it day in day out, he can really bring some inspirational moments.
“It is up to us to nullify them as much as we can and like I said, do what we can to get the win. A win for the team and the club will be good because we’ve had two defeats in a row now."
It not known if Mata will even start the game. he has played a bit-part role this season, despite scoring the winning goal against Hull City he may not be used from the start tomorrow.
But if he is, Bertrand will ensure his Southampton team-mates are aware of his qualities.