Forster joined Southampton from Scottish Premiership giants Celtic in the summer of 2014.
The England international cost £10 million in transfer fees, as reported by BBC Sport, and he lived up to expectations in his debut Premier League campaign.
The former Newcastle United prospect was a key figure in the Saints’ superb 2014-15 season, leading Clarke to speak highly of him.
“The 27-year-old goalkeeper spent much of 2014/15 flying under the radar, but he boasted an exceptional record,” the 40-year-old wrote on PremierLeague.com.
“Over the course of 30 starts, it took an average of 125 minutes to score against him, which was over half an hour longer than Chelsea’s Thibaut Courtois, which is partially explained by his enviable save percentage of almost 74%…
“Southampton’s new-look side needed a reliable presence as their last line of defence, and the England international provided that security in spades.”
Forster made 30 appearances in the Premier League for Southampton in the recently concluded 2014-15 campaign, and would have played more had he not suffered a serious knee injury in March.
The Englishman probably did not get the recognition that he deserved, but there is no doubt that he will slot straight back into the Saints’ starting line-up when he eventually recovers.
Whenever a player moves from Scotland to England, there are doubts. Many have failed to be successful in the Premier League after leaving the Scottish top flight, but Forster has been a huge success.